When is the last frost in Chemult, OR?

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

When is the first frost in Chemult, OR?

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 97731Chemult, OR

Frost is possible in any month near Chemult, based on NOAA 1991-2020 records for the Chemult, OR 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)	—	—	13 days	100%
Frost / freeze (32°F)	—	—	23 days	100%
Hard freeze (28°F)	—	—	52 days	100%

Where these dates come from

ZIP code 97731 is matched to the NOAA station Chemult, OR, 9.3 km away, at 4,760 ft elevation (88 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Chemult, OR (used)	4,760 ft	—	—
Crater Lake Nps Hq, OR	6,485 ft	—	—
Lemolo Lake 3 Nnw, OR	4,077 ft	Jun 1	Sep 23
Odell Lake-East, OR	4,800 ft	—	—

Frost dates near Chemult

Crescent, OR 97733 · last Jun 7, first Sep 18
Gilchrist, OR 97737 · last Jun 7, first Sep 18
Crater Lake, OR 97604 · last —, first —
Fort Klamath, OR 97626 · last —, first —
Fort Rock, OR 97735 · last —, first —
Silver Lake, OR 97638 · last —, first —
La Pine, OR 97739 · last Jun 7, first Sep 18
Chiloquin, OR 97624 · last —, first —

Frequently asked questions

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