Last spring frost
May 9
Frost Dates for East Hope, ID
First fall frost
Oct 8
Growing season
153 days
Hardiness zone
6b
In an average year around East Hope, ID, the last spring frost (32°F) is about May 9 and the first fall frost is about Oct 8, giving roughly a 153-day growing season. To be safe most years, wait until Apr 24 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 14 | May 28 | May 12 |
| Freeze (32°F) | May 25 | May 9 | Apr 24 |
| Hard (28°F) | May 9 | Apr 22 | Mar 31 |
| Severe (24°F) | Apr 21 | Mar 30 | Mar 9 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Jun 14 | Jun 5 | Jun 1 | May 30 | May 28 | May 24 | May 21 | May 17 | May 12 |
| 32°F | May 25 | May 19 | May 15 | May 12 | May 9 | May 5 | May 2 | Apr 29 | Apr 24 |
| 28°F | May 9 | May 3 | Apr 30 | Apr 26 | Apr 22 | Apr 18 | Apr 14 | Apr 7 | Mar 31 |
| 24°F | Apr 21 | Apr 13 | Apr 7 | Apr 2 | Mar 30 | Mar 25 | Mar 20 | Mar 15 | Mar 9 |
| 20°F | Mar 28 | Mar 21 | Mar 16 | Mar 13 | Mar 8 | Mar 6 | Mar 2 | Feb 26 | Feb 17 |
| 16°F | Mar 16 | Mar 10 | Mar 6 | Mar 3 | Mar 1 | Feb 25 | Feb 20 | Feb 12 | Jan 31 |
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 6 | Sep 23 | Oct 6 |
| Freeze (32°F) | Sep 25 | Oct 8 | Oct 26 |
| Hard (28°F) | Oct 5 | Oct 25 | Nov 13 |
| Severe (24°F) | Oct 20 | Nov 9 | Dec 1 |
Show full probability table (all thresholds & percentiles)
| °F | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 6 | Sep 11 | Sep 16 | Sep 20 | Sep 23 | Sep 26 | Sep 29 | Oct 2 | Oct 6 |
| 32°F | Sep 25 | Sep 29 | Oct 2 | Oct 5 | Oct 8 | Oct 12 | Oct 16 | Oct 19 | Oct 26 |
| 28°F | Oct 5 | Oct 11 | Oct 17 | Oct 21 | Oct 25 | Oct 28 | Nov 1 | Nov 6 | Nov 13 |
| 24°F | Oct 20 | Oct 28 | Nov 1 | Nov 5 | Nov 9 | Nov 14 | Nov 20 | Nov 26 | Dec 1 |
| 20°F | Oct 31 | Nov 8 | Nov 14 | Nov 20 | Nov 25 | Nov 29 | Dec 2 | Dec 8 | Dec 16 |
| 16°F | Nov 12 | Nov 21 | Nov 27 | Dec 1 | Dec 5 | Dec 10 | Dec 15 | Dec 22 | Dec 30 |
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: Cabinet Gorge, Id, about 12.6 miles away@if(!empty($station['elevation_ft'])), at 2,173 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 East Hope, ID?
On average, the last spring frost (32°F) around East Hope, ID is about May 9. In cooler years it can run later, so for a safer bet many gardeners wait until Apr 24.
When is the first frost in the fall?
The first fall frost around East Hope, ID typically arrives about Oct 8. 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 9 on average, or Apr 24 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 153 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 83836 Planting calendar → Idaho frost dates →
Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026