When is the last frost in Felt, ID?

For ZIP code 83424, the average last spring frost (32°F) is June 15, based on NOAA 1991-2020 climate normals for the Tetonia Exp Stn, ID weather station. There is a 1-in-10 chance of a frost after June 29.

When is the first frost in Felt, ID?

The average first fall frost (32°F) is September 7. There is a 1-in-10 chance of frost by August 24, so tender plants are at risk from that point on.

How long is the growing season in 83424?

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 83424Felt, ID

The average last spring frost in Felt is June 15 and the average first fall frost is September 7, giving a typical growing season of about 85 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jun 15
Average first fall frost: Sep 7
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)	—	—	57 days	100%
Frost / freeze (32°F)	May 24 · Jun 15 · Jun 29	Aug 24 · Sep 7 · Sep 23	85 days	100%
Hard freeze (28°F)	May 5 · May 21 · Jun 14	Sep 3 · Sep 20 · Oct 5	117 days	100%

Where these dates come from

ZIP code 83424 is matched to the NOAA station Tetonia Exp Stn, ID, 7.2 km away, at 6,170 ft elevation (150 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Tetonia Exp Stn, ID (used)	6,170 ft	Jun 15	Sep 7
Alta 1 Nnw, WY	6,440 ft	Jun 14	Sep 11
Driggs, ID	6,120 ft	Jun 13	Sep 9
Ashton 1N, ID	5,212 ft	May 21	Sep 21

Frost dates near Felt

Tetonia, ID 83452 · last Jun 13, first Sep 9
Driggs, ID 83422 · last Jun 13, first Sep 9
Alta, WY 83414 · last —, first —
Ashton, ID 83420 · last May 21, first Sep 21
Victor, ID 83455 · last Jun 13, first Sep 9
Chester, ID 83421 · last May 21, first Sep 21
Newdale, ID 83436 · last May 17, first Sep 22
Teton, ID 83451 · last May 17, first Sep 22

Frequently asked questions

When is the last frost in Felt, ID?: For ZIP code 83424, the average last spring frost (32°F) is June 15, based on NOAA 1991-2020 climate normals for the Tetonia Exp Stn, ID weather station. There is a 1-in-10 chance of a frost after June 29.
When is the first frost in Felt, ID?: The average first fall frost (32°F) is September 7. There is a 1-in-10 chance of frost by August 24, so tender plants are at risk from that point on.
How long is the growing season in 83424?: 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.