When is the last frost in Crater Lake, OR?

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

When is the first frost in Crater Lake, 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 97604Crater Lake, OR

Frost is possible in any month near Crater Lake, based on NOAA 1991-2020 records for the Crater Lake Nps Hq, 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)	—	—	29 days	100%
Frost / freeze (32°F)	—	—	55 days	100%
Hard freeze (28°F)	—	—	92 days	100%

Where these dates come from

ZIP code 97604 is matched to the NOAA station Crater Lake Nps Hq, OR, 6.4 km away, at 6,485 ft elevation (822 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Crater Lake Nps Hq, OR (used)	6,485 ft	—	—
Chiloquin 12 Nw (Fort Klamath), OR	4,180 ft	—	—
Prospect 2 Sw, OR	2,482 ft	May 19	Oct 3
Toketee Falls, OR	2,060 ft	Apr 29	Oct 18

Frost dates near Crater Lake

Prospect, OR 97536 · last May 19, first Oct 3
Fort Klamath, OR 97626 · last —, first —
Chemult, OR 97731 · last —, first —
Butte Falls, OR 97522 · last May 19, first Oct 3
Chiloquin, OR 97624 · last —, first —
Tiller, OR 97484 · last May 19, first Oct 3
Trail, OR 97541 · last May 19, first Oct 3
Shady Cove, OR 97539 · last Apr 29, first Oct 17

Frequently asked questions

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