Bruneau, ID frost dates
Last spring frostApr 17median date
First fall frostOct 17median date
Growing season183 daysfrost-free
Hardiness zone7aZone 7a
How Bruneau compares
- In 8 years out of 10, the last spring frost in Bruneau falls between March 31 and May 7, a 37-day window. The first fall frost falls between October 1 and November 1.
- The median last frost is 27 days earlier than the Idaho median of May 14.
- Its 183-day growing season is longer than 96% of the 244 Idaho places with a regular frost season (state median 138 days).
- The last frost is typical for zone 7a, where the median is Apr 16.
- The weather station records an average of 121 nights a year at or below 32°F.
- Compared with Boise, ID, 108 km away, the last frost here is 7 days earlier than there and the growing season is 3 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 31 |
| 50% (median) | April 17 |
| 10% (safe for tender plants) | May 7 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 1 |
| 50% (median) | October 17 |
| 90% (late) | November 1 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Bruneau, ID
Bruneau, ID frost dates — last frost Apr 17, first frost Oct 17, zone 7a. whenisthelastfrost.com
Crop
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Start indoors: Jan 23 to Feb 6Transplant outside: Mar 20 to Apr 3
Start indoors: Feb 6 to Feb 20Transplant outside: May 1 to May 15
Start indoors: Feb 6 to Feb 20Transplant outside: May 1 to May 15
Start indoors: Feb 20 to Mar 6Transplant outside: Apr 24 to May 8
Start indoors: Feb 20 to Mar 6Transplant outside: Mar 27 to Apr 10Sow outdoors: Mar 20 to Apr 24Plant for fall: Aug 22 to Sep 19
Start indoors: Feb 20 to Mar 6Transplant outside: Mar 20 to Apr 3Sow outdoors: Mar 20 to Apr 3Plant for fall: Aug 8 to Aug 29
Start indoors: Feb 20 to Mar 6Transplant outside: Apr 3 to Apr 17Plant for fall: Jul 11 to Aug 1
Start indoors: Feb 20 to Mar 6Transplant outside: Mar 27 to Apr 10Plant for fall: Jul 11 to Aug 1
Start indoors: Feb 20 to Mar 6Transplant outside: Apr 3 to Apr 17Plant for fall: Jul 11 to Aug 1
Start indoors: Mar 6 to Mar 20Transplant outside: May 8 to May 22Sow outdoors: May 8 to May 22
Start indoors: Mar 6 to Mar 20Transplant outside: Apr 24 to May 8
Sow outdoors: Mar 6 to Mar 27Plant for fall: Jul 25 to Aug 15
Sow outdoors: Mar 6 to Mar 27Plant for fall: Aug 22 to Sep 12
Sow outdoors: Mar 13 to Apr 24Plant for fall: Sep 5 to Sep 26
Start indoors: Mar 20 to Mar 27Transplant outside: May 1 to May 8Sow outdoors: Apr 24 to May 8Plant for fall: Aug 1 to Aug 15
Start indoors: Mar 20 to Mar 27Sow outdoors: Apr 24 to May 8Plant for fall: Aug 8 to Aug 22
Start indoors: Mar 20 to Mar 27Sow outdoors: Apr 24 to May 8
Start indoors: Mar 20 to Mar 27Transplant outside: May 1 to May 15
Sow outdoors: Mar 27 to Apr 24Plant for fall: Jul 25 to Aug 8
Sow outdoors: Mar 27 to Apr 24Plant for fall: Aug 8 to Aug 22
Sow outdoors: Mar 27 to Apr 17
Sow outdoors: Apr 3 to May 1Plant for fall: Aug 8 to Aug 22
Sow outdoors: Apr 3 to Apr 24Plant for fall: Aug 22 to Sep 12
Sow outdoors: Apr 24 to May 15Plant for fall: Aug 1 to Aug 15
Sow outdoors: Apr 24 to May 8
Transplant outside: May 1 to May 22
Plant for fall: Oct 3 to Nov 7
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Bruneau, ID
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 23 – Feb 6 | Mar 20 – Apr 3 | — | — |
| Peppers | Feb 6 – Feb 20 | May 1 – May 15 | — | — |
| Eggplant | Feb 6 – Feb 20 | May 1 – May 15 | — | — |
| Tomatoes | Feb 20 – Mar 6 | Apr 24 – May 8 | — | — |
| Lettuce | Feb 20 – Mar 6 | Mar 27 – Apr 10 | Mar 20 – Apr 24 | Aug 22 – Sep 19 |
| Kale | Feb 20 – Mar 6 | Mar 20 – Apr 3 | Mar 20 – Apr 3 | Aug 8 – Aug 29 |
| Broccoli | Feb 20 – Mar 6 | Apr 3 – Apr 17 | — | Jul 11 – Aug 1 |
| Cabbage | Feb 20 – Mar 6 | Mar 27 – Apr 10 | — | Jul 11 – Aug 1 |
| Cauliflower | Feb 20 – Mar 6 | Apr 3 – Apr 17 | — | Jul 11 – Aug 1 |
| Okra | Mar 6 – Mar 20 | May 8 – May 22 | May 8 – May 22 | — |
| Basil | Mar 6 – Mar 20 | Apr 24 – May 8 | — | — |
| Peas | — | — | Mar 6 – Mar 27 | Jul 25 – Aug 15 |
| Spinach | — | — | Mar 6 – Mar 27 | Aug 22 – Sep 12 |
| Radishes | — | — | Mar 13 – Apr 24 | Sep 5 – Sep 26 |
| Cucumbers | Mar 20 – Mar 27 | May 1 – May 8 | Apr 24 – May 8 | Aug 1 – Aug 15 |
| Zucchini & Summer Squash | Mar 20 – Mar 27 | — | Apr 24 – May 8 | Aug 8 – Aug 22 |
| Winter Squash & Pumpkins | Mar 20 – Mar 27 | — | Apr 24 – May 8 | — |
| Melons & Watermelon | Mar 20 – Mar 27 | May 1 – May 15 | — | — |
| Carrots | — | — | Mar 27 – Apr 24 | Jul 25 – Aug 8 |
| Beets | — | — | Mar 27 – Apr 24 | Aug 8 – Aug 22 |
| Potatoes | — | — | Mar 27 – Apr 17 | — |
| Swiss Chard | — | — | Apr 3 – May 1 | Aug 8 – Aug 22 |
| Cilantro | — | — | Apr 3 – Apr 24 | Aug 22 – Sep 12 |
| Green Beans | — | — | Apr 24 – May 15 | Aug 1 – Aug 15 |
| Sweet Corn | — | — | Apr 24 – May 8 | — |
| Sweet Potatoes | — | May 1 – May 22 | — | — |
| Garlic | — | — | — | Oct 3 – Nov 7 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Bruneau, ID weather station, 30 km away (elevation 2,530 ft (771 m)).
Frost dates near Bruneau
- Grand View Apr 28 · Oct 6
- Hammett May 1 · Oct 3
- Glenns Ferry May 1 · Oct 3
- Mountain Home May 2 · Oct 8
- King Hill May 1 · Oct 3
- Murphy May 31 · Oct 6
- Castleford May 17 · Sep 29
- Hagerman May 3 · Oct 1
- Bliss May 3 · Oct 1
- Buhl Apr 25 · Oct 15
Frequently asked questions
When is the last frost in Bruneau, ID?
The median last spring frost in Bruneau, ID is April 17. There is still about a 10% chance of frost after May 7, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Bruneau, ID?
The median first fall frost is October 17, with about a 10% chance of frost before October 1.
How long is the growing season in Bruneau, ID?
About 183 days between the median last spring frost and first fall frost.
What planting zone is Bruneau, ID?
Bruneau, ID is in USDA hardiness zone 7a.