Frost dates / Idaho / Pocatello

Frost dates in Pocatello, ID

The station on this page is POCATELLO CITY, ID US (USC00107210), 0.9 miles from the city point. Population in the Census 2024 estimate is 58,231.

Zone 6aUSDA average annual extreme minimum -10°F to -5°F, from ZIP 83209 (2.2 miles from the city point used on this page).

Median last 32°F is May 2. Median first 32°F is October 11. The 50% growing-season length is 161 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 17	Earlier date. A last 32°F on or after this day is common.
50%	May 2	Median.
10%	May 18	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 26	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 11	Median.
90%	October 26	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%	180
50%	161
90%	139

28°F threshold

	10%	50%	90%
Last, on or after	May 4	April 17	March 30
First, on or before	October 8	October 24	November 6
Season at least	211 days	188 days	165 days

36°F threshold

	10%	50%	90%
Last, on or after	June 5	May 17	May 1
First, on or before	September 12	September 30	October 15
Season at least	156 days	134 days	110 days

Station POCATELLO CITY, ID US (USC00107210). Completeness flag R, 15 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 1359.4 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

Pocatello, ID

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

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

Idaho. Nearest qualified station: POCATELLO CITY, ID US (USC00107210), 0.9 miles. Median last 32°F May 2. Median first 32°F October 11. The 50% growing-season length is 161 days.

Open the ZIP page

32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 18	May 2	April 17
First 32°F on or before	September 26	October 11	October 26

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 Idaho 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.