When is the last frost in Saratoga, WY?

For ZIP code 82331, the average last spring frost (32°F) is June 12, based on NOAA 1991-2020 climate normals for the Saratoga 4N, WY weather station. There is a 1-in-10 chance of a frost after June 30.

When is the first frost in Saratoga, WY?

The average first fall frost (32°F) is September 7. There is a 1-in-10 chance of frost by August 22, so tender plants are at risk from that point on.

How long is the growing season in 82331?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 83 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 82331Saratoga, WY

The average last spring frost in Saratoga is June 12 and the average first fall frost is September 7, giving a typical growing season of about 83 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jun 12
Average first fall frost: Sep 7
Growing season: 83 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)	—	—	57 days	100%
Frost / freeze (32°F)	May 25 · Jun 12 · Jun 30	Aug 22 · Sep 7 · Sep 19	83 days	100%
Hard freeze (28°F)	May 9 · May 25 · Jun 16	Sep 1 · Sep 16 · Sep 30	111 days	100%

Where these dates come from

ZIP code 82331 is matched to the NOAA station Saratoga 4N, WY, 3 km away, at 6,801 ft elevation (79 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Saratoga 4N, WY (used)	6,801 ft	Jun 12	Sep 7
Saratoga, WY	6,790 ft	Jun 2	Sep 12
Elk Mtn, WY	7,265 ft	May 28	Sep 13
Rawlins Muni Ap, WY	6,736 ft	Jun 1	Sep 15

Frost dates near Saratoga

Walcott, WY 82335 · last Jun 1, first Sep 15
Shirley Basin, WY 82615 · last Jun 1, first Sep 15
Encampment, WY 82325 · last May 28, first Sep 13
Elk Mountain, WY 82324 · last May 28, first Sep 13
Sinclair, WY 82334 · last Jun 1, first Sep 15
Hanna, WY 82327 · last Jun 1, first Sep 8
Rawlins, WY 82301 · last Jun 1, first Sep 15
Medicine Bow, WY 82329 · last Jun 1, first Sep 8

Frequently asked questions

When is the last frost in Saratoga, WY?: For ZIP code 82331, the average last spring frost (32°F) is June 12, based on NOAA 1991-2020 climate normals for the Saratoga 4N, WY weather station. There is a 1-in-10 chance of a frost after June 30.
When is the first frost in Saratoga, WY?: The average first fall frost (32°F) is September 7. There is a 1-in-10 chance of frost by August 22, so tender plants are at risk from that point on.
How long is the growing season in 82331?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 83 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.