When is the last frost in Grand Lake, CO?

Frost is possible in any month at the nearest NOAA station (Grand Lake 1 Nw, CO), so there is no reliable average last frost date.

When is the first frost in Grand Lake, CO?

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 80447Grand Lake, CO

Frost is possible in any month near Grand Lake, based on NOAA 1991-2020 records for the Grand Lake 1 Nw, CO 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)	—	—	20 days	100%
Frost / freeze (32°F)	—	—	54 days	100%
Hard freeze (28°F)	May 29 · Jun 12 · Jun 27	Aug 28 · Sep 10 · Sep 22	88 days	100%

Where these dates come from

ZIP code 80447 is matched to the NOAA station Grand Lake 1 Nw, CO, 4.9 km away, at 8,721 ft elevation (144 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Grand Lake 1 Nw, CO (used)	8,721 ft	—	—
Grand Lake 6 Ssw, CO	8,288 ft	Jun 13	Sep 7
Allenspark 3Nw, CO	8,500 ft	Jun 14	Sep 12
Estes Park 3 Sse, CO	7,812 ft	May 30	Sep 17

Frost dates near Grand Lake

Granby, CO 80446 · last Jun 13, first Sep 7
Hot Sulphur Springs, CO 80451 · last Jun 12, first Sep 10
Tabernash, CO 80478 · last —, first —
Allenspark, CO 80510 · last Jun 14, first Sep 12
Fraser, CO 80442 · last —, first —
Estes Park, CO 80517 · last May 30, first Sep 17
Ward, CO 80481 · last Jun 5, first Sep 16
Parshall, CO 80468 · last —, first —

Frequently asked questions

When is the last frost in Grand Lake, CO?: Frost is possible in any month at the nearest NOAA station (Grand Lake 1 Nw, CO), so there is no reliable average last frost date.
When is the first frost in Grand Lake, CO?: 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.