Frost dates / Colorado / Grand Junction

Frost dates in Grand Junction, CO

The station on this page is GRAND JUNCTION WALKER FLD, CO US (USW00023066), 3.4 miles from the city point. Population in the Census 2024 estimate is 70,554.

Zone 7aUSDA average annual extreme minimum 0°F to 5°F, from ZIP 81501 (1.7 miles from the city point used on this page).

Median last 32°F is April 28. Median first 32°F is October 16. The 50% growing-season length is 171 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 11	Earlier date. A last 32°F on or after this day is common.
50%	April 28	Median.
10%	May 14	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%	October 3	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 16	Median.
90%	October 29	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%	190
50%	171
90%	152

28°F threshold

	10%	50%	90%
Last, on or after	May 2	April 13	March 24
First, on or before	October 12	October 27	November 10
Season at least	219 days	196 days	170 days

36°F threshold

	10%	50%	90%
Last, on or after	May 25	May 8	April 25
First, on or before	September 24	October 6	October 19
Season at least	169 days	152 days	131 days

Station GRAND JUNCTION WALKER FLD, CO US (USW00023066). Completeness flag S, 29 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 1480.7 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.

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Grand Junction, CO

Zone 7aAverage annual extreme minimum 0°F to 5°F

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

Colorado. Nearest qualified station: GRAND JUNCTION WALKER FLD, CO US (USW00023066), 3.4 miles. Median last 32°F April 28. Median first 32°F October 16. The 50% growing-season length is 171 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 14	April 28	April 11
First 32°F on or before	October 3	October 16	October 29

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.

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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.

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