Frost dates / Colorado / Pueblo

Frost dates in Pueblo, CO

The station on this page is PUEBLO RSVR, CO US (USC00056765), 5.8 miles from the city point. Population in the Census 2024 estimate is 111,166.

Zone 6aUSDA average annual extreme minimum -10°F to -5°F, from ZIP 81003 (2.5 miles from the city point used on this page).

Median last 32°F is April 26. Median first 32°F is October 13. The 50% growing-season length is 166 days. The green band runs from the median last frost to the median first frost. Thin ticks mark the 10%, 50%, and 90% dates.

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Last 32°F in spring

NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.

Probability	Date	How to read it
90%	April 13	Earlier date. A last 32°F on or after this day is common.
50%	April 26	Median.
10%	May 8	Later date. A last 32°F on or after this day is uncommon.

First 32°F in fall

NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.

Probability	Date	How to read it
10%	September 30	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 13	Median.
90%	October 25	Later date. A first 32°F on or before this day is common.

32°F growing-season length

Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.

Probability the season is at least this long	Days
10%	184
50%	166
90%	149

28°F threshold

	10%	50%	90%
Last, on or after	April 30	April 16	April 1
First, on or before	October 6	October 22	November 4
Season at least	208 days	186 days	165 days

36°F threshold

	10%	50%	90%
Last, on or after	May 19	May 6	April 24
First, on or before	September 24	October 5	October 17
Season at least	166 days	150 days	133 days

Station PUEBLO RSVR, CO US (USC00056765). Completeness flag R, 25 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 100%. Freeze dates are conditional on that threshold occurring. Elevation 1481.6 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.

Check a crop against this station

Pueblo, CO

Zone 6aAverage annual extreme minimum -10°F to -5°F

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Colorado. Nearest qualified station: PUEBLO RSVR, CO US (USC00056765), 5.8 miles. Median last 32°F April 26. Median first 32°F October 13. The 50% growing-season length is 166 days.

Open the ZIP page

32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 8	April 26	April 13
First 32°F on or before	September 30	October 13	October 25

Column order matches the NCEI file: for the last freeze, 10% is the later date and 90% is the earlier date. How to read the probabilities.

A wall calendar surrounded by vegetables, herbs, seed packets, and watering cans.

Planting calendar

Frost dates for Colorado are above. Planting windows appear for states with a cited extension guide. The fall and seed tools use the numbers you enter and the station dates.

Date checks use your device’s calendar and appear after the page loads.