When is the last frost in Carey, ID?

For ZIP code 83320, the average last spring frost (32°F) is June 16, based on NOAA 1991-2020 climate normals for the Picabo, ID weather station. There is a 1-in-10 chance of a frost after June 30.

When is the first frost in Carey, ID?

The average first fall frost (32°F) is September 9. There is a 1-in-10 chance of frost by August 25, so tender plants are at risk from that point on.

How long is the growing season in 83320?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 85 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 83320Carey, ID

The average last spring frost in Carey is June 16 and the average first fall frost is September 9, giving a typical growing season of about 85 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jun 16
Average first fall frost: Sep 9
Growing season: 85 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)	—	—	58 days	100%
Frost / freeze (32°F)	Jun 3 · Jun 16 · Jun 30	Aug 25 · Sep 9 · Sep 24	85 days	100%
Hard freeze (28°F)	May 9 · Jun 2 · Jun 19	Sep 5 · Sep 23 · Oct 7	115 days	100%

Where these dates come from

ZIP code 83320 is matched to the NOAA station Picabo, ID, 14.6 km away, at 4,839 ft elevation (62 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Picabo, ID (used)	4,839 ft	Jun 16	Sep 9
Richfield, ID	4,309 ft	May 24	Sep 26
Craters Of The Moon, ID	5,914 ft	Jun 19	Sep 9
Arco 17 Sw, ID	5,920 ft	May 24	Oct 1

Frost dates near Carey

Picabo, ID 83348 · last Jun 16, first Sep 9
Richfield, ID 83349 · last May 24, first Sep 26
Bellevue, ID 83313 · last May 13, first Oct 2
Hailey, ID 83333 · last May 13, first Oct 2
Sun Valley, ID 83354 · last —, first —
Dietrich, ID 83324 · last Apr 24, first Oct 16
Shoshone, ID 83352 · last Apr 24, first Oct 16
Arco, ID 83213 · last May 22, first Sep 22

Frequently asked questions

When is the last frost in Carey, ID?: For ZIP code 83320, the average last spring frost (32°F) is June 16, based on NOAA 1991-2020 climate normals for the Picabo, ID weather station. There is a 1-in-10 chance of a frost after June 30.
When is the first frost in Carey, ID?: The average first fall frost (32°F) is September 9. There is a 1-in-10 chance of frost by August 25, so tender plants are at risk from that point on.
How long is the growing season in 83320?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 85 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.