When is the last frost in Dillon, CO?

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

When is the first frost in Dillon, 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 80435Dillon, CO

Frost is possible in any month near Dillon, based on NOAA 1991-2020 records for the Dillon 1 E, 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)	—	—	16 days	100%
Frost / freeze (32°F)	—	—	41 days	100%
Hard freeze (28°F)	Jun 5 · Jun 18 · Jul 6	Aug 24 · Sep 6 · Sep 19	78 days	100%

Where these dates come from

ZIP code 80435 is matched to the NOAA station Dillon 1 E, CO, 6.3 km away, at 9,065 ft elevation (390 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Dillon 1 E, CO (used)	9,065 ft	—	—
Cabin Creek, CO	10,021 ft	Jun 6	Sep 19
Georgetown, CO	8,520 ft	May 30	Sep 19
Grant, CO	8,675 ft	Jun 15	Sep 9

Frost dates near Dillon

Silverthorne, CO 80497 · last —, first —
Breckenridge, CO 80424 · last Jun 6, first Sep 19
Frisco, CO 80443 · last —, first —
Silver Plume, CO 80476 · last Jun 6, first Sep 19
Georgetown, CO 80444 · last May 30, first Sep 19
Vail, CO 81657 · last Jun 21, first Sep 7
Grant, CO 80448 · last Jun 15, first Sep 9
Empire, CO 80438 · last May 30, first Sep 19

Frequently asked questions

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