Last spring frost
May 2
Frost Dates for Pocatello, ID
First fall frost
Oct 11
Growing season
161 days
Hardiness zone
6a
In an average year around Pocatello, ID, the last spring frost (32°F) is about May 2 and the first fall frost is about Oct 11, giving roughly a 161-day growing season. To be safe most years, wait until Apr 17 before setting out tender plants.
Last spring frost
Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Jun 5 | May 17 | May 1 |
| Freeze (32°F) | May 18 | May 2 | Apr 17 |
| Hard (28°F) | May 4 | Apr 17 | Mar 30 |
| Severe (24°F) | Apr 17 | Mar 30 | Mar 9 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 5 | May 29 | May 24 | May 21 | May 17 | May 14 | May 10 | May 7 | May 1 |
| 32°F | May 18 | May 13 | May 9 | May 5 | May 2 | Apr 29 | Apr 27 | Apr 23 | Apr 17 |
| 28°F | May 4 | Apr 28 | Apr 24 | Apr 20 | Apr 17 | Apr 13 | Apr 10 | Apr 5 | Mar 30 |
| 24°F | Apr 17 | Apr 10 | Apr 6 | Apr 1 | Mar 30 | Mar 26 | Mar 21 | Mar 15 | Mar 9 |
| 20°F | Mar 30 | Mar 23 | Mar 18 | Mar 13 | Mar 10 | Mar 7 | Mar 4 | Mar 1 | Feb 24 |
| 16°F | Mar 13 | Mar 9 | Mar 6 | Mar 3 | Mar 1 | Feb 27 | Feb 23 | Feb 18 | Feb 11 |
First fall frost
Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.
| Frost intensity | Early (10%) | Average (50%) | Late (90%) |
|---|---|---|---|
| Light (36°F) | Sep 12 | Sep 30 | Oct 15 |
| Freeze (32°F) | Sep 26 | Oct 11 | Oct 26 |
| Hard (28°F) | Oct 8 | Oct 24 | Nov 6 |
| Severe (24°F) | Oct 19 | Nov 3 | Nov 18 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 12 | Sep 19 | Sep 24 | Sep 27 | Sep 30 | Oct 2 | Oct 5 | Oct 9 | Oct 15 |
| 32°F | Sep 26 | Oct 2 | Oct 5 | Oct 9 | Oct 11 | Oct 15 | Oct 18 | Oct 21 | Oct 26 |
| 28°F | Oct 8 | Oct 14 | Oct 18 | Oct 20 | Oct 24 | Oct 26 | Oct 30 | Nov 2 | Nov 6 |
| 24°F | Oct 19 | Oct 25 | Oct 29 | Nov 1 | Nov 3 | Nov 6 | Nov 9 | Nov 13 | Nov 18 |
| 20°F | Oct 27 | Nov 1 | Nov 6 | Nov 10 | Nov 14 | Nov 16 | Nov 19 | Nov 22 | Nov 26 |
| 16°F | Nov 3 | Nov 10 | Nov 15 | Nov 19 | Nov 22 | Nov 25 | Nov 28 | Dec 1 | Dec 7 |
Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.
Where this data comes from
@endif These dates are computed from the nearest official weather station with long-term records: Pocatello City, Id, about 1.6 miles away@if(!empty($station['elevation_ft'])), at 4,460 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.
How we calculate these dates
Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.
Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.
Frequently asked questions
When is the last frost in Pocatello, ID?
On average, the last spring frost (32°F) around Pocatello, ID is about May 2. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 17.
When is the first frost in the fall?
The first fall frost around Pocatello, ID typically arrives about Oct 11. Count back by a crop's days to maturity to find the latest date you can plant it.
When can I plant tomatoes and other tender crops?
Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around May 2 on average, or Apr 17 to be safe most years.
How long is the growing season here?
The frost-free growing season (between the last spring and first fall 32°F frost) is about 161 days in a typical year.
Are these dates a forecast for this year?
No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.
Local weather for 83209 Planting calendar → Idaho frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026