When is the last frost in Minturn, CO?

For ZIP code 81645, the average last spring frost (32°F) is June 21, based on NOAA 1991-2020 climate normals for the Vail, CO weather station. There is a 1-in-10 chance of a frost after July 9.

When is the first frost in Minturn, CO?

The average first fall frost (32°F) is September 7. There is a 1-in-10 chance of frost by August 26, so tender plants are at risk from that point on.

How long is the growing season in 81645?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 77 days long.

Are these frost dates a forecast?

No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.

Frost dates for 81645Minturn, CO

The average last spring frost in Minturn is June 21 and the average first fall frost is September 7, giving a typical growing season of about 77 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jun 21
Average first fall frost: Sep 7
Growing season: 77 days

Frost risk by date

NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.

Spring dates: chance of a frost AFTER the date. Fall dates: chance of a frost BEFORE the date.
Temperature	Last spring: 90% / 50% / 10% chance	First fall: 10% / 50% / 90% chance	Growing season (50%)	Years with at least one
Light frost (36°F)	—	—	40 days	100%
Frost / freeze (32°F)	Jun 8 · Jun 21 · Jul 9	Aug 26 · Sep 7 · Sep 20	77 days	100%
Hard freeze (28°F)	May 16 · May 31 · Jun 18	Sep 7 · Sep 21 · Oct 2	109 days	100%

Where these dates come from

ZIP code 81645 is matched to the NOAA station Vail, CO, 8.5 km away, at 8,305 ft elevation (358 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Vail, CO (used)	8,305 ft	Jun 21	Sep 7
Climax, CO	11,345 ft	—	—
Dillon 1 E, CO	9,065 ft	—	—
Green Mt Dam, CO	7,741 ft	Jun 6	Sep 14

Frost dates near Minturn

Vail, CO 81658 · last Jun 6, first Sep 14
Red Cliff, CO 81649 · last Jun 21, first Sep 7
Avon, CO 81620 · last Jun 6, first Sep 14
Edwards, CO 81632 · last —, first —
Frisco, CO 80443 · last —, first —
Wolcott, CO 81655 · last Jun 14, first Sep 5
Silverthorne, CO 80498 · last —, first —
Eagle, CO 81631 · last —, first —

Frequently asked questions

When is the last frost in Minturn, CO?: For ZIP code 81645, the average last spring frost (32°F) is June 21, based on NOAA 1991-2020 climate normals for the Vail, CO weather station. There is a 1-in-10 chance of a frost after July 9.
When is the first frost in Minturn, CO?: The average first fall frost (32°F) is September 7. There is a 1-in-10 chance of frost by August 26, so tender plants are at risk from that point on.
How long is the growing season in 81645?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 77 days long.
Are these frost dates a forecast?: No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.