When is the last frost in Monarch, CO?

For ZIP code 81227, the average last spring frost (32°F) is June 20, based on NOAA 1991-2020 climate normals for the Taylor Park, CO weather station. There is a 1-in-10 chance of a frost after July 2.

When is the first frost in Monarch, CO?

The average first fall frost (32°F) is September 8. There is a 1-in-10 chance of frost by August 25, so tender plants are at risk from that point on.

How long is the growing season in 81227?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 80 days long.

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 81227Monarch, CO

The average last spring frost in Monarch is June 20 and the average first fall frost is September 8, giving a typical growing season of about 80 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jun 20
Average first fall frost: Sep 8
Growing season: 80 days

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)	—	—	43 days	100%
Frost / freeze (32°F)	Jun 7 · Jun 20 · Jul 2	Aug 25 · Sep 8 · Sep 19	80 days	100%
Hard freeze (28°F)	May 20 · Jun 2 · Jun 16	Sep 9 · Sep 22 · Oct 3	111 days	100%

Where these dates come from

ZIP code 81227 is matched to the NOAA station Taylor Park, CO, 40.2 km away, at 9,180 ft elevation (483 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Taylor Park, CO (used)	9,180 ft	Jun 20	Sep 8
Sargents, CO	8,460 ft	—	—
Salida, CO	7,160 ft	May 29	Sep 20
Buena Vista 2S, CO	7,954 ft	May 27	Sep 23

Frost dates near Monarch

Poncha Springs, CO 81242 · last May 29, first Sep 20
Sargents, CO 81248 · last —, first —
Pitkin, CO 81241 · last Jun 20, first Sep 8
Nathrop, CO 81236 · last May 27, first Sep 23
Salida, CO 81201 · last May 29, first Sep 20
Ohio City, CO 81237 · last Jun 20, first Sep 8
Parlin, CO 81239 · last Jun 20, first Sep 8
Villa Grove, CO 81155 · last —, first —

Frequently asked questions

When is the last frost in Monarch, CO?: For ZIP code 81227, the average last spring frost (32°F) is June 20, based on NOAA 1991-2020 climate normals for the Taylor Park, CO weather station. There is a 1-in-10 chance of a frost after July 2.
When is the first frost in Monarch, CO?: The average first fall frost (32°F) is September 8. There is a 1-in-10 chance of frost by August 25, so tender plants are at risk from that point on.
How long is the growing season in 81227?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 80 days long.
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.