Colorado area codes
Colorado has 6 area codes. Denver alone has three. All on Mountain Time.
Calling Colorado right now
Calling hours: Every day, 8 AM to 9 PM (the federal rule)
Calling a lot of them? RegieGO dials up to five lines at once. See the dialer
When can you call Colorado numbers?
Sales calls to homes and cell phones have legal hours, set by the federal rule. Hold every number to them, since you can't tell a work line from a personal cell. Each area code's page has its local time now.
What applies in ColoradoEvery day, 8 AM to 9 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
Colorado area code FAQ
How many area codes does Colorado have?
6: 303, 719, 720, 748, 970 and 983.
What time zone is Colorado area codes in?
Mountain Time (MST, UTC-7; MDT, UTC-6 in summer).
What is the newest Colorado area code?
748, in service since July 7, 2025.
When can you call Colorado numbers?
Every day, 8 AM to 9 PM, local time, under the federal rule.
Calling Colorado numbers? Reach more of them.
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