When is the last frost in Tower, MN?

Frost is possible in any month at the nearest NOAA station (Tower 2S, MN), so there is no reliable average last frost date.

When is the first frost in Tower, MN?

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 55790Tower, MN

Frost is possible in any month near Tower, based on NOAA 1991-2020 records for the Tower 2S, MN 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)	—	—	58 days	100%
Frost / freeze (32°F)	—	—	89 days	100%
Hard freeze (28°F)	May 7 · May 26 · Jun 16	Sep 2 · Sep 20 · Oct 6	118 days	100%

Where these dates come from

ZIP code 55790 is matched to the NOAA station Tower 2S, MN, 3.1 km away, at 1,430 ft elevation (65 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Tower 2S, MN (used)	1,430 ft	—	—
Embarrass, MN	1,425 ft	—	—
Cook 8Ne, MN	1,355 ft	May 12	Oct 1
Babbitt, MN	1,481 ft	May 28	Sep 14

Frost dates near Tower

Soudan, MN 55782 · last —, first —
Embarrass, MN 55732 · last —, first —
Angora, MN 55703 · last May 12, first Oct 1
Babbitt, MN 55706 · last May 28, first Sep 14
Britt, MN 55710 · last May 12, first Oct 1
Biwabik, MN 55708 · last —, first —
Cook, MN 55723 · last May 12, first Oct 1
Ely, MN 55731 · last May 14, first Sep 29

Frequently asked questions

When is the last frost in Tower, MN?: Frost is possible in any month at the nearest NOAA station (Tower 2S, MN), so there is no reliable average last frost date.
When is the first frost in Tower, MN?: 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.