When is the last frost in Auburn, WY?

For ZIP code 83111, the average last spring frost (32°F) is June 20, based on NOAA 1991-2020 climate normals for the Afton, WY weather station. There is a 1-in-10 chance of a frost after July 7.

When is the first frost in Auburn, WY?

The average first fall frost (32°F) is September 1. There is a 1-in-10 chance of frost by August 12, so tender plants are at risk from that point on.

How long is the growing season in 83111?

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 83111Auburn, WY

The average last spring frost in Auburn is June 20 and the average first fall frost is September 1, giving a typical growing season of about 71 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jun 20
Average first fall frost: Sep 1
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)	—	—	42 days	100%
Frost / freeze (32°F)	Jun 2 · Jun 20 · Jul 7	Aug 12 · Sep 1 · Sep 15	71 days	100%
Hard freeze (28°F)	May 10 · Jun 1 · Jun 20	Aug 29 · Sep 13 · Sep 27	104 days	100%

Where these dates come from

ZIP code 83111 is matched to the NOAA station Afton, WY, 10 km away, at 6,248 ft elevation (215 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Afton, WY (used)	6,248 ft	Jun 20	Sep 1
Bedford 3 Se, WY	6,355 ft	—	—
Soda Springs Ap, ID	5,842 ft	—	—
Bern, ID	5,964 ft	Jun 17	Sep 3

Frost dates near Auburn

Grover, WY 83122 · last —, first —
Bedford, WY 83112 · last —, first —
Afton, WY 83110 · last Jun 20, first Sep 1
Fairview, WY 83119 · last Jun 20, first Sep 1
Thayne, WY 83127 · last —, first —
Smoot, WY 83126 · last Jun 20, first Sep 1
Freedom, WY 83120 · last —, first —
Etna, WY 83118 · last —, first —

Frequently asked questions

When is the last frost in Auburn, WY?: For ZIP code 83111, the average last spring frost (32°F) is June 20, based on NOAA 1991-2020 climate normals for the Afton, WY weather station. There is a 1-in-10 chance of a frost after July 7.
When is the first frost in Auburn, WY?: The average first fall frost (32°F) is September 1. There is a 1-in-10 chance of frost by August 12, so tender plants are at risk from that point on.
How long is the growing season in 83111?: 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.