When is the last frost in Randolph, UT?

For ZIP code 84064, the average last spring frost (32°F) is June 14, based on NOAA 1991-2020 climate normals for the Randolph, UT weather station. There is a 1-in-10 chance of a frost after June 30.

When is the first frost in Randolph, UT?

The average first fall frost (32°F) is September 1. There is a 1-in-10 chance of frost by August 18, so tender plants are at risk from that point on.

How long is the growing season in 84064?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 76 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 84064Randolph, UT

The average last spring frost in Randolph is June 14 and the average first fall frost is September 1, giving a typical growing season of about 76 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jun 14
Average first fall frost: Sep 1
Growing season: 76 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)	—	—	48 days	100%
Frost / freeze (32°F)	May 31 · Jun 14 · Jun 30	Aug 18 · Sep 1 · Sep 13	76 days	100%
Hard freeze (28°F)	May 13 · May 30 · Jun 14	Aug 31 · Sep 11 · Sep 25	105 days	100%

Where these dates come from

ZIP code 84064 is matched to the NOAA station Randolph, UT, 0.5 km away, at 6,290 ft elevation (7 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Randolph, UT (used)	6,290 ft	Jun 14	Sep 1
Woodruff, UT	6,315 ft	—	—
Laketown, UT	5,980 ft	May 28	Sep 24
Sage 4 Nnw, WY	6,210 ft	—	—

Frost dates near Randolph

Laketown, UT 84038 · last Jun 14, first Sep 1
Woodruff, UT 84086 · last —, first —
Garden City, UT 84028 · last May 15, first Oct 4
Evanston, WY 82930 · last Jun 12, first Sep 12
Fish Haven, ID 83287 · last May 15, first Oct 4
Cokeville, WY 83114 · last —, first —
Providence, UT 84332 · last Apr 30, first Oct 16
Millville, UT 84326 · last May 12, first Sep 28

Frequently asked questions

When is the last frost in Randolph, UT?: For ZIP code 84064, the average last spring frost (32°F) is June 14, based on NOAA 1991-2020 climate normals for the Randolph, UT weather station. There is a 1-in-10 chance of a frost after June 30.
When is the first frost in Randolph, UT?: The average first fall frost (32°F) is September 1. There is a 1-in-10 chance of frost by August 18, so tender plants are at risk from that point on.
How long is the growing season in 84064?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 76 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.