The 970 area code serves northern and western Colorado, from the Front Range cities of Fort Collins and Greeley to the Western Slope hub of Grand Junction and the world-famous mountain resorts of Aspen, Vail, and Steamboat Springs. Created in 1995 when it split from 303, 970 covers the largest and most scenic geographic region in the state.

Quick Summary of the 970 Area Code

Area Code970
StateColorado (CO)
RegionNorthern & Western Colorado (Fort Collins, Grand Junction & the Western Slope)
Major CitiesFort Collins, Greeley, Loveland, Grand Junction, Durango, Aspen, Vail, Steamboat Springs
Time ZoneMountain Time (MT) – MST / MDT
Dialing Format7 or 10-digit dialing

Geographic Coverage

The 970 area code covers roughly the northern and western two-thirds of Colorado outside the Denver metro and the southern corner. It includes the northern Front Range cities of Fort Collins, Greeley, and Loveland, the Western Slope commercial center of Grand Junction, the southwestern city of Durango, and the mountain resort towns of Aspen, Vail, and Steamboat Springs. It borders Wyoming, Nebraska, Utah, and New Mexico.

Time Zone

The 970 area code observes Mountain Time (MT). Clocks follow Mountain Standard Time (UTC−7) in winter and shift to Mountain Daylight Time (UTC−6) from mid-March through early November. All of Colorado is on Mountain Time. From the West Coast, this region is one hour ahead of Pacific Time, so a 9:00 AM call in California reaches a 970 number at 10:00 AM local time.

Tip: Business hours across the 970 region generally run 9:00 AM to 5:00 PM Mountain Time, Monday through Friday.

How to Dial a 970 Number

Area code 970 is not part of an overlay, so it has traditionally allowed 7-digit local dialing. However, 10-digit dialing is now the recommended nationwide standard, and dialing the full 10-digit number (970 + the line number) always works reliably. For international callers, dial your country’s exit code, then +1 (the North American country code), then 970, followed by the seven-digit local number.

Scam Alerts for the 970 Area Code

Like every U.S. area code, 970 has been used by scammers who spoof local numbers to appear trustworthy. Residents in Fort Collins, Greeley, Loveland, Grand Junction, Durango, Aspen, Vail, Steamboat Springs should stay alert to the following common tactics:

Scam TypeWhat to Watch For
IRS / Tax ScamsCallers claiming you owe back taxes and threatening arrest unless you pay immediately.
Utility Shut-offFake Xcel Energy callers demanding instant payment to keep your power on.
Vacation Rental ScamFraudulent resort-town rental listings in Aspen or Vail that vanish after you pay a deposit.
Student Loan ScamCalls offering fake loan forgiveness to Colorado State University students for a fee.

If you receive a suspicious call from a 970 number, take these steps to protect yourself:

  1. Do not share personal information such as Social Security numbers, bank details, or passwords over the phone.
  2. Hang up and verify by calling the organization back using an official number from its website.
  3. Report the call to the FTC at reportfraud.ftc.gov and to the Colorado Attorney General’s Office.
  4. Block the number and consider registering with the National Do Not Call Registry.

Red Flag: Legitimate agencies such as the IRS, Social Security Administration, or your local utility company (Xcel Energy or Colorado Springs Utilities) will never demand immediate payment by gift card, wire transfer, or cryptocurrency. Any 970 caller making such a demand is a scammer.

History and Economy of the 970 Region

n

Area code 970 was created in 1995, split from 303, to serve northern and western Colorado as the state grew. The regional economy is remarkably diverse. Fort Collins is home to Colorado State University and a strong technology and craft-brewing sector, while Greeley anchors one of the most productive agricultural and energy regions in the country – Weld County leads the state in both cattle and oil-and-gas production, and the JBS meatpacking operation is a major employer. On the Western Slope, Grand Junction serves as the regional hub and center of Colorado’s wine country, while the mountain resorts of Aspen, Vail, and Steamboat Springs make tourism and recreation a cornerstone of the economy.

n

Looking Up a 970 Number

n

To identify a 970 caller, use a reverse phone lookup or search the full 10-digit number online. Businesses, universities, resorts, and government offices across northern and western Colorado publish their 970 numbers, so a legitimate caller is often easy to confirm with a quick search. For unknown numbers, let the call go to voicemail – genuine callers usually leave a message, while robocallers and scammers rarely do.

Nearby & Related Area Codes

Colorado is served by several area codes. If you are researching 970, these neighboring and overlay codes are worth knowing:

You can also browse our full directory of Colorado area codes for more regional guides.

↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.

Explore Neighboring States

Researching area codes just across the state line? Start with these codes in the states that border Colorado:

Frequently Asked Questions

Where is the 970 area code located?

The 970 area code covers northern and western Colorado, including Fort Collins, Greeley, Loveland, Grand Junction, Durango, Aspen, Vail, and Steamboat Springs.

Does 970 have an overlay?

No. The 970 area code covers its large northern and western Colorado region on its own and currently has no overlay code.

Do I need to dial 10 digits for 970?

Because 970 has no overlay, 7-digit local dialing has historically worked, but dialing the full 10 digits is now the recommended standard and always works.

What time zone is the 970 area code in?

The 970 area code observes Mountain Time (MST/MDT), like all of Colorado.

Related 970 Guides