When is the last frost in Copper Center, AK?

Frost is possible in any month at the nearest NOAA station (Gennallen Kcam, AK), so there is no reliable average last frost date.

When is the first frost in Copper Center, AK?

Frost is possible in any month at the nearest NOAA station.

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 99573Copper Center, AK

Frost is possible in any month near Copper Center, based on NOAA 1991-2020 records for the Gennallen Kcam, AK station.

Frost is possible in any month. Even summer nights can drop to freezing at this station, so protect tender plants whenever cold nights are forecast.

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)	—	—	36 days	100%
Frost / freeze (32°F)	—	—	61 days	100%
Hard freeze (28°F)	May 13 · May 29 · Jun 13	Aug 14 · Sep 1 · Sep 18	92 days	100%

Where these dates come from

ZIP code 99573 is matched to the NOAA station Gennallen Kcam, AK, 18.1 km away, at 1,383 ft elevation (333 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Gennallen Kcam, AK (used)	1,383 ft	—	—
Gulkana Ap, AK	1,562 ft	Jun 7	Aug 21
Tonsina, AK	1,579 ft	—	—
Silver Lake, AK	1,200 ft	May 31	Sep 3

Frost dates near Copper Center

Glennallen, AK 99588 · last Jun 7, first Aug 21
Gakona, AK 99586 · last Jun 7, first Aug 21
Chitina, AK 99566 · last May 31, first Sep 3

Frequently asked questions

When is the last frost in Copper Center, AK?: Frost is possible in any month at the nearest NOAA station (Gennallen Kcam, AK), so there is no reliable average last frost date.
When is the first frost in Copper Center, AK?: Frost is possible in any month at the nearest NOAA station.
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.