When is the last frost in Ophir, CO?

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

When is the first frost in Ophir, 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 81426Ophir, CO

Frost is possible in any month near Ophir, based on NOAA 1991-2020 records for the Silverton, 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)	—	—	40 days	100%
Hard freeze (28°F)	Jun 9 · Jun 22 · Jul 5	Aug 26 · Sep 9 · Sep 20	77 days	100%

Where these dates come from

ZIP code 81426 is matched to the NOAA station Silverton, CO, 15.8 km away, at 9,286 ft elevation (403 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Silverton, CO (used)	9,286 ft	—	—
Telluride 4Wnw, CO	8,646 ft	—	—
Ouray, CO	7,840 ft	May 17	Oct 1
Ouray #2, CO	7,718 ft	May 18	Oct 4

Frost dates near Ophir

Telluride, CO 81435 · last —, first —
Silverton, CO 81433 · last —, first —
Ouray, CO 81427 · last May 17, first Oct 1
Rico, CO 81332 · last —, first —
Placerville, CO 81430 · last May 26, first Sep 29
Ridgway, CO 81432 · last Jun 11, first Sep 13
Norwood, CO 81423 · last May 25, first Oct 1
Lake City, CO 81235 · last Jun 15, first Sep 11

Frequently asked questions

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