When is the last frost in Laramie, WY?

For ZIP code 82070, the average last spring frost (32°F) is June 7, based on NOAA 1991-2020 climate normals for the Laramie 2 Nw, WY weather station. There is a 1-in-10 chance of a frost after June 29.

When is the first frost in Laramie, WY?

The average first fall frost (32°F) is September 4. 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 82070?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 88 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 82070Laramie, WY

The average last spring frost in Laramie is June 7 and the average first fall frost is September 4, giving a typical growing season of about 88 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jun 7
Average first fall frost: Sep 4
Growing season: 88 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)	—	—	53 days	100%
Frost / freeze (32°F)	May 23 · Jun 7 · Jun 29	Aug 17 · Sep 4 · Sep 18	88 days	100%
Hard freeze (28°F)	May 9 · May 22 · Jun 6	Sep 2 · Sep 14 · Sep 29	116 days	100%

Where these dates come from

ZIP code 82070 is matched to the NOAA station Laramie 2 Nw, WY, 19.6 km away, at 7,140 ft elevation (32 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Laramie 2 Nw, WY (used)	7,140 ft	Jun 7	Sep 4
Laramie Rgnl Ap, WY	7,266 ft	Jun 2	Sep 15
Laramie 4Se, WY	7,390 ft	May 22	Sep 28
Centennial 1Ne, WY	8,170 ft	Jun 2	Sep 19

Frost dates near Laramie

Centennial, WY 82055 · last Jun 2, first Sep 15
Laramie, WY 82073 · last Jun 7, first Sep 4
Bosler, WY 82051 · last Jun 7, first Sep 4
Rock River, WY 82083 · last Jun 1, first Sep 8
Jelm, WY 82063 · last —, first —
Tie Siding, WY 82084 · last —, first —
Buford, WY 82052 · last May 31, first Sep 19
Horse Creek, WY 82061 · last May 27, first Sep 19

Frequently asked questions

When is the last frost in Laramie, WY?: For ZIP code 82070, the average last spring frost (32°F) is June 7, based on NOAA 1991-2020 climate normals for the Laramie 2 Nw, WY weather station. There is a 1-in-10 chance of a frost after June 29.
When is the first frost in Laramie, WY?: The average first fall frost (32°F) is September 4. 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 82070?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 88 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.