When is the last frost in Winter Park, CO?

For ZIP code 80482, the average last spring frost (32°F) is June 21, based on NOAA 1991-2020 climate normals for the Boulder 14 W, CO weather station. There is a 1-in-10 chance of a frost after July 4.

When is the first frost in Winter Park, CO?

The average first fall frost (32°F) is September 2. There is a 1-in-10 chance of frost by August 17, so tender plants are at risk from that point on.

How long is the growing season in 80482?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 71 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 80482Winter Park, CO

The average last spring frost in Winter Park is June 21 and the average first fall frost is September 2, giving a typical growing season of about 71 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jun 21
Average first fall frost: Sep 2
Growing season: 71 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)	—	—	39 days	100%
Frost / freeze (32°F)	Jun 7 · Jun 21 · Jul 4	Aug 17 · Sep 2 · Sep 15	71 days	100%
Hard freeze (28°F)	May 22 · Jun 4 · Jun 20	Sep 2 · Sep 14 · Sep 27	100 days	100%

Where these dates come from

ZIP code 80482 is matched to the NOAA station Boulder 14 W, CO, 26 km away, at 9,829 ft elevation (136 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Boulder 14 W, CO (used)	9,829 ft	Jun 21	Sep 2
Fraser, CO	8,560 ft	—	—
Georgetown, CO	8,520 ft	May 30	Sep 19
Cabin Creek, CO	10,021 ft	Jun 6	Sep 19

Frost dates near Winter Park

Fraser, CO 80442 · last —, first —
Tabernash, CO 80478 · last —, first —
Empire, CO 80438 · last May 30, first Sep 19
Dumont, CO 80436 · last May 24, first Sep 23
Silver Plume, CO 80476 · last Jun 6, first Sep 19
Georgetown, CO 80444 · last May 30, first Sep 19
Idaho Springs, CO 80452 · last Jun 6, first Sep 19
Granby, CO 80446 · last Jun 13, first Sep 7

Frequently asked questions

When is the last frost in Winter Park, CO?: For ZIP code 80482, the average last spring frost (32°F) is June 21, based on NOAA 1991-2020 climate normals for the Boulder 14 W, CO weather station. There is a 1-in-10 chance of a frost after July 4.
When is the first frost in Winter Park, CO?: The average first fall frost (32°F) is September 2. There is a 1-in-10 chance of frost by August 17, so tender plants are at risk from that point on.
How long is the growing season in 80482?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 71 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.