When is the last frost in Eagle, AK?

For ZIP code 99738, the average last spring frost (32°F) is May 29, based on NOAA 1991-2020 climate normals for the Eagle, AK weather station. There is a 1-in-10 chance of a frost after June 11.

When is the first frost in Eagle, AK?

The average first fall frost (32°F) is August 23. There is a 1-in-10 chance of frost by August 8, so tender plants are at risk from that point on.

How long is the growing season in 99738?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 86 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 99738Eagle, AK

The average last spring frost in Eagle is May 29 and the average first fall frost is August 23, giving a typical growing season of about 86 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: May 29
Average first fall frost: Aug 23
Growing season: 86 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)	—	—	61 days	100%
Frost / freeze (32°F)	May 18 · May 29 · Jun 11	Aug 8 · Aug 23 · Sep 4	86 days	100%
Hard freeze (28°F)	May 7 · May 18 · May 31	Aug 21 · Sep 3 · Sep 19	109 days	100%

Where these dates come from

ZIP code 99738 is matched to the NOAA station Eagle, AK, 0.3 km away, at 850 ft elevation (26 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Eagle, AK (used)	850 ft	May 29	Aug 23
Eagle Ap, AK	908 ft	—	—
Chicken, AK	1,800 ft	—	—
Circle Hot Springs, AK	860 ft	—	—

Frost dates near Eagle

Chicken, AK 99732 · last —, first —

Frequently asked questions

When is the last frost in Eagle, AK?: For ZIP code 99738, the average last spring frost (32°F) is May 29, based on NOAA 1991-2020 climate normals for the Eagle, AK weather station. There is a 1-in-10 chance of a frost after June 11.
When is the first frost in Eagle, AK?: The average first fall frost (32°F) is August 23. There is a 1-in-10 chance of frost by August 8, so tender plants are at risk from that point on.
How long is the growing season in 99738?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 86 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.