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Best Money Market Rates in Castle Rock, Colorado (CO) - May 2026

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Brian McKay Brian McKay
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Editorial Disclosure The rates displayed are actual, verified rates sourced directly from the official websites of banks and credit unions. Our editorial content is independent of any advertiser relationships.
| ✓Fact Checked | Last Updated: May 15, 2026

Current Castle Rock, Colorado and the surrounding area money market deposit account rates include Premier Members Credit UnionPremier Members Credit Union6355 Promenade Pkwy, Castle Rock, CO 80108A+5.0 ★Texas Ratio: 4.73% Money Market at 4.00% APY, Bellco Credit UnionBellco Credit Union4611 Milestone Ln, Castle Rock, CO 80104A+5.0 ★Texas Ratio: 4.87% Premier Money Market Account at 3.25% APY, Westerra Credit UnionWesterra Credit Union4625 Trail Boss Dr, Castle Rock, CO 80104 2803A+5.0 ★Texas Ratio: 3.61% Money Market Select at 3.00% APY, Ent Credit UnionEnt Credit Union190 S Wilcox St Ste G, Castle Rock, CO 80104A+5.0 ★Texas Ratio: 4.95% Money Market Savings at 1.60% APY, and Independent Bank Mckinney, TXIndependent Bank Mckinney, TX501 Wilcox St, Castle Rock, CO 80104A+5.0 ★Texas Ratio: 2.30% Business Money Markets at 0.50% APY. Money market rates as of May 15, 2026 according to verified data from MonitorBankRates.

Castle Rock has 5 local institutions in our database, with money market rates as high as 4.00% APY from Premier Members Credit Union at 6355 Promenade Pkwy, Castle Rock, CO 80108. Use the table below to compare all available offers, including options from institutions serving the broader Colorado area. Rates are continually updated — we recommend checking back frequently.

Rates reflect recent market quotes and representative offers available to depositors in Castle Rock, Colorado and surrounding area. Last Updated and Verified: May 15, 2026

Compare the Best Money Market Rates Today in Castle Rock, Colorado & the Surrounding Area

Source: Verified Money Market Rate Data provided by MonitorBankRates
Institution
Product
APY
Min Deposit
Profile
Premier Members Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.73%
6355 Promenade Pkwy, Castle Rock, CO 80108
Money Market
4.00%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 2, 2026
Details

Bellco Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.87%
4611 Milestone Ln, Castle Rock, CO 80104
Business Premier Money Market Account
3.25%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Bellco Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.87%
4611 Milestone Ln, Castle Rock, CO 80104
Premier Money Market
3.25%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Qualifying balance up to $50,000.00

Bellco Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.87%
4611 Milestone Ln, Castle Rock, CO 80104
Business Money Market Account
3.25%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Bellco Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.87%
4611 Milestone Ln, Castle Rock, CO 80104
Premier Money Market Account
3.25%
$10,000
View
▼
Rate3.20%
Min Deposit$10,000
Min Balance—
UpdatedMay 12, 2026
Details

Westerra Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 3.61%
4625 Trail Boss Dr, Castle Rock, CO 80104 2803
Money Market Select
3.00%
$0
View
▼
Rate2.96%
Min Deposit$0
Min Balance—
UpdatedMay 10, 2026
Details

If requirements*** are met, the following rate will apply

Bellco Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.87%
4611 Milestone Ln, Castle Rock, CO 80104
Business Premier Money Market Account
2.70%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Bellco Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.87%
4611 Milestone Ln, Castle Rock, CO 80104
Member Money Market Account
2.70%
$0
View
▼
Rate2.66%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Bellco Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.87%
4611 Milestone Ln, Castle Rock, CO 80104
Premier Money Market Account
2.70%
$10,000
View
▼
Rate2.66%
Min Deposit$10,000
Min Balance—
UpdatedMay 12, 2026
Details

Bellco Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.87%
4611 Milestone Ln, Castle Rock, CO 80104
Member Money Market Account
2.35%
$0
View
▼
Rate2.32%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Bellco Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.87%
4611 Milestone Ln, Castle Rock, CO 80104
Business Money Market Account
2.25%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Ent Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.95%
190 S Wilcox St Ste G, Castle Rock, CO 80104
Money Market Savings
1.60%
$0
View
▼
Rate1.59%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Ent Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.95%
190 S Wilcox St Ste G, Castle Rock, CO 80104
Business Money Market Savings
1.60%
$0
View
▼
Rate1.59%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Ent Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.95%
190 S Wilcox St Ste G, Castle Rock, CO 80104
Money Market Savings
1.30%
$0
View
▼
Rate1.29%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Ent Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.95%
190 S Wilcox St Ste G, Castle Rock, CO 80104
Business Money Market Savings
1.30%
$0
View
▼
Rate1.29%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Westerra Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 3.61%
4625 Trail Boss Dr, Castle Rock, CO 80104 2803
Money Market Account
1.00%
$0
View
▼
Rate0.99%
Min Deposit$0
Min Balance—
UpdatedMay 10, 2026
Details

Premier Members Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.73%
6355 Promenade Pkwy, Castle Rock, CO 80108
Money Market
1.00%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 2, 2026
Details

Ent Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.95%
190 S Wilcox St Ste G, Castle Rock, CO 80104
Money Market Savings
1.00%
$0
View
▼
Rate1.00%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Ent Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.95%
190 S Wilcox St Ste G, Castle Rock, CO 80104
Business Money Market Savings
1.00%
$0
View
▼
Rate1.00%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Westerra Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 3.61%
4625 Trail Boss Dr, Castle Rock, CO 80104 2803
Business Money Market Accounts
0.90%
$0
View
▼
Rate0.90%
Min Deposit$0
Min Balance—
UpdatedMay 10, 2026
Details

Westerra Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 3.61%
4625 Trail Boss Dr, Castle Rock, CO 80104 2803
Money Market Account
0.90%
$0
View
▼
Rate0.90%
Min Deposit$0
Min Balance—
UpdatedMay 10, 2026
Details

Ent Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.95%
190 S Wilcox St Ste G, Castle Rock, CO 80104
Business Money Market Savings
0.80%
$0
View
▼
Rate0.80%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Ent Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.95%
190 S Wilcox St Ste G, Castle Rock, CO 80104
Money Market Savings
0.80%
$0
View
▼
Rate0.80%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Westerra Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 3.61%
4625 Trail Boss Dr, Castle Rock, CO 80104 2803
Business Money Market Accounts
0.80%
$0
View
▼
Rate0.80%
Min Deposit$0
Min Balance—
UpdatedMay 10, 2026
Details

Westerra Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 3.61%
4625 Trail Boss Dr, Castle Rock, CO 80104 2803
Money Market Account
0.80%
$0
View
▼
Rate0.80%
Min Deposit$0
Min Balance—
UpdatedMay 10, 2026
Details

Premier Members Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.73%
6355 Promenade Pkwy, Castle Rock, CO 80108
Money Market
0.75%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 2, 2026
Details

Westerra Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 3.61%
4625 Trail Boss Dr, Castle Rock, CO 80104 2803
Business Money Market Accounts
0.70%
$0
View
▼
Rate0.70%
Min Deposit$0
Min Balance—
UpdatedMay 10, 2026
Details

Westerra Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 3.61%
4625 Trail Boss Dr, Castle Rock, CO 80104 2803
Money Market Account
0.70%
$0
View
▼
Rate0.70%
Min Deposit$0
Min Balance—
UpdatedMay 10, 2026
Details

Westerra Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 3.61%
4625 Trail Boss Dr, Castle Rock, CO 80104 2803
Business Money Market Accounts
0.60%
$0
View
▼
Rate0.60%
Min Deposit$0
Min Balance—
UpdatedMay 10, 2026
Details

Westerra Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 3.61%
4625 Trail Boss Dr, Castle Rock, CO 80104 2803
Money Market Account
0.60%
$0
View
▼
Rate0.60%
Min Deposit$0
Min Balance—
UpdatedMay 10, 2026
Details

Ent Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.95%
190 S Wilcox St Ste G, Castle Rock, CO 80104
Business Money Market Savings
0.60%
$0
View
▼
Rate0.60%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Ent Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.95%
190 S Wilcox St Ste G, Castle Rock, CO 80104
Money Market Savings
0.60%
$0
View
▼
Rate0.60%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Premier Members Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.73%
6355 Promenade Pkwy, Castle Rock, CO 80108
Money Market
0.50%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 2, 2026
Details

Westerra Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 3.61%
4625 Trail Boss Dr, Castle Rock, CO 80104 2803
Business Money Market Accounts
0.50%
$0
View
▼
Rate0.50%
Min Deposit$0
Min Balance—
UpdatedMay 10, 2026
Details

Independent Bank Mckinney, TX
Institution Rating:
A+5.0 ★ Texas Ratio: 2.30%
501 Wilcox St, Castle Rock, CO 80104
Business Money Markets
0.50%
$0
View
▼
Rate0.50%
Min Deposit$0
Min Balance—
UpdatedMay 5, 2026
Details

Independent Bank Mckinney, TX
Institution Rating:
A+5.0 ★ Texas Ratio: 2.30%
501 Wilcox St, Castle Rock, CO 80104
Business Money Markets
0.35%
$0
View
▼
Rate0.35%
Min Deposit$0
Min Balance—
UpdatedMay 5, 2026
Details

Premier Members Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.73%
6355 Promenade Pkwy, Castle Rock, CO 80108
Money Market
0.25%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 2, 2026
Details

Independent Bank Mckinney, TX
Institution Rating:
A+5.0 ★ Texas Ratio: 2.30%
501 Wilcox St, Castle Rock, CO 80104
Business Money Markets
0.20%
$0
View
▼
Rate0.20%
Min Deposit$0
Min Balance—
UpdatedMay 5, 2026
Details

Ent Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.95%
190 S Wilcox St Ste G, Castle Rock, CO 80104
Money Market Savings
0.15%
$0
View
▼
Rate0.15%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Ent Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.95%
190 S Wilcox St Ste G, Castle Rock, CO 80104
Business Money Market Savings
0.15%
$0
View
▼
Rate0.15%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Independent Bank Mckinney, TX
Institution Rating:
A+5.0 ★ Texas Ratio: 2.30%
501 Wilcox St, Castle Rock, CO 80104
Business Money Markets
0.15%
$0
View
▼
Rate0.15%
Min Deposit$0
Min Balance—
UpdatedMay 5, 2026
Details

Independent Bank Mckinney, TX
Institution Rating:
A+5.0 ★ Texas Ratio: 2.30%
501 Wilcox St, Castle Rock, CO 80104
Business Money Markets
0.10%
$0
View
▼
Rate0.10%
Min Deposit$0
Min Balance—
UpdatedMay 5, 2026
Details

Ent Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.95%
190 S Wilcox St Ste G, Castle Rock, CO 80104
Money Market Savings
0.10%
$0
View
▼
Rate0.10%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Ent Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.95%
190 S Wilcox St Ste G, Castle Rock, CO 80104
Business Money Market Savings
0.10%
$0
View
▼
Rate0.10%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Westerra Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 3.61%
4625 Trail Boss Dr, Castle Rock, CO 80104 2803
Money Market Select
0.05%
$0
View
▼
Rate0.05%
Min Deposit$0
Min Balance—
UpdatedMay 10, 2026
Details

If requirements*** are not met, the following rate will apply

Independent Bank Mckinney, TX
Institution Rating:
A+5.0 ★ Texas Ratio: 2.30%
501 Wilcox St, Castle Rock, CO 80104
Business Money Markets
0.00%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 5, 2026
Details

Bellco Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.87%
4611 Milestone Ln, Castle Rock, CO 80104
Premier Money Market Account
0.00%
$10,000
View
▼
Rate—
Min Deposit$10,000
Min Balance—
UpdatedMay 12, 2026
Details

Bellco Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.87%
4611 Milestone Ln, Castle Rock, CO 80104
Member Money Market Account
0.00%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Bellco Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 4.87%
4611 Milestone Ln, Castle Rock, CO 80104
Business Premier Money Market Account
0.00%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

The Huntington National Bank
Institution Rating:
A+5.0 ★ Texas Ratio: 4.60%
High-Yield Money Market
3.82%
$25,000
View
▼
Rate—
Min Deposit$25,000
Min Balance—
UpdatedMay 4, 2026
Details

Minimum of **$25,000** not currently deposited at Huntington.

The Huntington National Bank
Institution Rating:
A+5.0 ★ Texas Ratio: 4.60%
Huntington Relationship Money Market
3.82%
$25,000
View
▼
Rate—
Min Deposit$25,000
Min Balance—
UpdatedMay 4, 2026
Details

Golden Belt Bank, FSA
Institution Rating:
A5.0 ★ Texas Ratio: 6.19%
Money Market
3.71%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 4, 2026
Details

Golden Belt Bank, FSA
Institution Rating:
A5.0 ★ Texas Ratio: 6.19%
Business Money Market
3.67%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 4, 2026
Details

Academy Bank
Institution Rating:
A+5.0 ★ Texas Ratio: 5.58%
Premier Money Market
3.65%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 4, 2026
Details

introductory rate

Together Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 5.65%
Money Market
3.50%
$0
View
▼
Rate3.44%
Min Deposit$0
Min Balance—
UpdatedMay 10, 2026
Details

New money only

Together Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 5.65%
Money Market (IRA)
3.50%
$0
View
▼
Rate3.44%
Min Deposit$0
Min Balance—
UpdatedMay 10, 2026
Details

New money only

Horizons North Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 0.05%
Best in Show Money Market
3.50%
$0
View
▼
Rate3.44%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Sunflower Bank
Institution Rating:
A+5.0 ★ Texas Ratio: 5.67%
Thrive Money Market
3.45%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 4, 2026
Details

$24,999.01 & Above

The Huntington National Bank
Institution Rating:
A+5.0 ★ Texas Ratio: 4.60%
Huntington Relationship Money Market
3.20%
$25,000
View
▼
Rate—
Min Deposit$25,000
Min Balance—
UpdatedMay 4, 2026
Details

The Huntington National Bank
Institution Rating:
A+5.0 ★ Texas Ratio: 4.60%
High-Yield Money Market
3.20%
$25,000
View
▼
Rate—
Min Deposit$25,000
Min Balance—
UpdatedMay 4, 2026
Details

Minimum of **$25,000** not currently deposited at Huntington.

Sunflower Bank
Institution Rating:
A+5.0 ★ Texas Ratio: 5.67%
Thrive Money Market
3.05%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 4, 2026
Details

$24,999.00 & Below

Armed Forces Bank
Institution Rating:
A+5.0 ★ Texas Ratio: 4.63%
Premier Money Market
3.05%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 4, 2026
Details

Horizons North Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 0.05%
Best in Show Money Market
3.00%
$0
View
▼
Rate2.96%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Meriwest Credit Union
Institution Rating:
A5.0 ★ Texas Ratio: 9.41%
Business Money Market Plus
3.00%
$0
View
▼
Rate2.96%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

Elevations Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 1.22%
Business Money Market Account
3.00%
$0
View
▼
Rate2.96%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

$500,000 - $999,999.99

Elevations Credit Union
Institution Rating:
A+5.0 ★ Texas Ratio: 1.22%
Business Money Market Account and up
3.00%
$0
View
▼
Rate2.96%
Min Deposit$0
Min Balance—
UpdatedMay 12, 2026
Details

$1,000,000

Grand Valley Bank
Institution Rating:
A5.0 ★ Texas Ratio: 11.80%
Money Market Account
2.70%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 5, 2026
Details

Golden Belt Bank, FSA
Institution Rating:
A5.0 ★ Texas Ratio: 6.19%
Business Money Market
2.33%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 4, 2026
Details

Academy Bank
Institution Rating:
A+5.0 ★ Texas Ratio: 5.58%
Premier Money Market
2.20%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 4, 2026
Details

Grand Valley Bank
Institution Rating:
A5.0 ★ Texas Ratio: 11.80%
Money Market Account
2.20%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 5, 2026
Details

Qualifying balance up to $999,999.99

North Valley Bank Thornton, CO
Institution Rating:
A+5.0 ★ Texas Ratio: 0.00%
Consumer or Business Tiered Money Market
2.02%
$1,000
View
▼
Rate—
Min Deposit$1,000
Min Balance—
UpdatedMay 15, 2026
Details

5Star Bank
Institution Rating:
A+5.0 ★ Texas Ratio: 0.13%
Money Market
2.00%
$1,000
View
▼
Rate1.98%
Min Deposit$1,000
Min Balance—
UpdatedMay 5, 2026
Details

5Star Bank
Institution Rating:
A+5.0 ★ Texas Ratio: 0.13%
Money Market personal personal savings money market
2.00%
$1,000
View
▼
Rate1.98%
Min Deposit$1,000
Min Balance—
UpdatedMay 5, 2026
Details

Grand Valley Bank
Institution Rating:
A5.0 ★ Texas Ratio: 11.80%
Money Market Account
1.70%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 5, 2026
Details

Qualifying balance up to $249,999.99

Golden Belt Bank, FSA
Institution Rating:
A5.0 ★ Texas Ratio: 6.19%
Business Money Market
1.61%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 4, 2026
Details

Golden Belt Bank, FSA
Institution Rating:
A5.0 ★ Texas Ratio: 6.19%
Money Market
1.61%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 4, 2026
Details

5Star Bank
Institution Rating:
A+5.0 ★ Texas Ratio: 0.13%
Money Market
1.50%
$1,000
View
▼
Rate1.49%
Min Deposit$1,000
Min Balance—
UpdatedMay 5, 2026
Details

5Star Bank
Institution Rating:
A+5.0 ★ Texas Ratio: 0.13%
Money Market personal personal savings money market
1.50%
$1,000
View
▼
Rate1.49%
Min Deposit$1,000
Min Balance—
UpdatedMay 5, 2026
Details

Academy Bank
Institution Rating:
A+5.0 ★ Texas Ratio: 5.58%
Premier Money Market
1.50%
$0
View
▼
Rate—
Min Deposit$0
Min Balance—
UpdatedMay 4, 2026
Details

The Annual Percentage Yields (APYs) displayed are based on the highest APY offered for the specified deposit amount or less. Rates may change without prior notice. Rates reflect recent market quotes and representative offers available to depositors in Castle Rock, Colorado and the surrounding area.

Banks and Credit Unions: If you identify an incorrect rate or wish to request the removal of your institution’s data, please contact us here.

Castle Rock, CO Money Market Rate Trends

Compare local Castle Rock, CO money market quotes against the statewide average

Daily money market rate averages tracked across our database of 8,500+ banks and credit unions — updated every evening.

View Full Colorado MMA Trends →
High-Yield MMA — CO Avg
3.477%
Unchanged vs 7 days ago

Colorado high-yield MMA rates currently average 3.477% APY.

Standard MMA — CO Avg
1.104%
Unchanged vs 7 days ago

Colorado standard MMA rates currently average 1.104% APY.

As of May 15, 2026 • Rate data sourced from 8,500+ monitored institutions Powered by MonitorBankRates

Methodology & Data Sources

Independent, Free, and Unbiased Rate Comparisons: MonitorBankRates.com is an independent rate comparison service. Our Castle Rock, Colorado money market rate tables are free for consumers to use, and we do not receive payment from any financial institution to be included or to be ranked in any particular order. Listings are based solely on the rates each institution publicly advertises on its own website.

A Note on Third-Party Rate Tools: Some pages on our site also feature rate comparison widgets and tools provided by third-party partners. These tools may include sponsored listings or affiliate links, and we may receive compensation when users click through them. We clearly label these widgets so you can tell at a glance which rates come from our independent MonitorBankRates.com tables and which come from our advertising partners.

Direct-Sourced & Verified Money Market Rate Data: We aggregate money market deposit account rates for Castle Rock, Colorado directly from the official websites of banks and credit unions using our proprietary rate aggregation technology and a dedicated team of rate updaters. Every money market rate displayed on MonitorBankRates.com is highly accurate and trustworthy.

Local, Regional, and National Coverage: Our systems constantly monitor the market to provide a complete picture of available yields in Castle Rock, Colorado. We feature a comprehensive mix of institutions from neighborhood credit unions and mid-sized regional banks to large national institutions available to savers in CO.

Daily Updates & Time-Stamped Accuracy: Our rate updaters verify and update money market rates daily. Because MMA yields can fluctuate rapidly based on market conditions, every product listed features its own specific “last updated” date, giving you complete transparency.

Frequently Asked Questions about Money Market Accounts in Castle Rock, Colorado

What is a Money Market Account (MMA)?

A Money Market Account (MMA), formally known as a money market deposit account (MMDA), is a type of deposit account that often pays higher interest rates than standard savings accounts. They usually come with check-writing privileges and debit card access, offering a balance of growth and liquidity for savers in Colorado.

Are Money Market accounts in Castle Rock, Colorado safe?

Yes, as long as the institution is FDIC insured (for banks) or NCUA insured (for credit unions). This provides federal protection for your deposits in Colorado up to $250,000 per depositor, per institution.

How often do MMA rates change in Castle Rock, Colorado?

Money market rates are variable and can change at any time based on market conditions and Federal Reserve decisions. We update our local Colorado rate tables daily to ensure you see the most current high-yield options.

Can I write checks from a Money Market Account?

Yes, most Money Market Accounts allow you to write a limited number of checks or make debit card transactions each month (typically up to 6), making them more flexible than a standard savings account.

How much do I need to deposit to open a money market account in Castle Rock, Colorado?

Minimum deposit requirements vary widely. Some online money market deposit accounts can be opened with no minimum, while many banks and credit unions in Castle Rock, Colorado require an initial deposit of $1,000 to $2,500 to earn the highest advertised APY. Larger deposits often unlock higher rate tiers, and FDIC or NCUA insurance protects deposits up to $250,000 per depositor, per institution.

Best Money Market Rates in Castle Rock, Colorado

Here are some of the highest money market account APYs currently available in Castle Rock, Colorado and the surrounding area:
  • Premier Members Credit Union
    Money Market — 4.00% APY
  • Bellco Credit Union
    Premier Money Market Account — 3.25% APY
  • Westerra Credit Union
    Money Market Select — 3.00% APY
  • Ent Credit Union
    Money Market Savings — 1.60% APY
  • Independent Bank Mckinney, TX
    Business Money Markets — 0.50% APY
Money Market Rates reflect actual verified offers from banks and credit unions actively accepting deposits in Castle Rock, Colorado. Your final available rate may depend on deposit amount and daily market movements. Last Updated and Verified: May 15, 2026

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