Howe, ID frost dates
Last spring frostMay 24median date
First fall frostSep 14median date
Growing season113 daysfrost-free
Hardiness zone5aZone 5a
How Howe compares
- In 8 years out of 10, the last spring frost in Howe falls between May 6 and June 14, a 39-day window. The first fall frost falls between September 1 and September 28.
- The median last frost is 10 days later than the Idaho median of May 14.
- Its 113-day growing season is longer than 18% of the 244 Idaho places with a regular frost season (state median 138 days).
- The last frost is 21 days later than the zone 5a median of May 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5a chart.
- The weather station records an average of 189 nights a year at or below 32°F.
- Compared with Idaho Falls, ID, 99 km away, the last frost here is 15 days later than there and the growing season is 32 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 6 |
| 50% (median) | May 24 |
| 10% (safe for tender plants) | June 14 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 1 |
| 50% (median) | September 14 |
| 90% (late) | September 28 |
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 Howe, ID
Howe, ID frost dates — last frost May 24, first frost Sep 14, zone 5a. whenisthelastfrost.com
Crop
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Start indoors: Mar 1 to Mar 15Transplant outside: Apr 26 to May 10
Start indoors: Mar 15 to Mar 29Transplant outside: Jun 7 to Jun 21
Start indoors: Mar 15 to Mar 29Transplant outside: Jun 7 to Jun 21
Start indoors: Mar 29 to Apr 12Transplant outside: May 31 to Jun 14
Start indoors: Mar 29 to Apr 12Transplant outside: May 3 to May 17Sow outdoors: Apr 26 to May 31Plant for fall: Jul 20 to Aug 17
Start indoors: Mar 29 to Apr 12Transplant outside: Apr 26 to May 10Sow outdoors: Apr 26 to May 10Plant for fall: Jul 6 to Jul 27
Start indoors: Mar 29 to Apr 12Transplant outside: May 10 to May 24Plant for fall: Jun 8 to Jun 29
Start indoors: Mar 29 to Apr 12Transplant outside: May 3 to May 17Plant for fall: Jun 8 to Jun 29
Start indoors: Mar 29 to Apr 12Transplant outside: May 10 to May 24Plant for fall: Jun 8 to Jun 29
Start indoors: Apr 12 to Apr 26Transplant outside: Jun 14 to Jun 28Sow outdoors: Jun 14 to Jun 28
Start indoors: Apr 12 to Apr 26Transplant outside: May 31 to Jun 14
Sow outdoors: Apr 12 to May 3Plant for fall: Jun 22 to Jul 13
Sow outdoors: Apr 12 to May 3Plant for fall: Jul 20 to Aug 10
Sow outdoors: Apr 19 to May 31Plant for fall: Aug 3 to Aug 24
Start indoors: Apr 26 to May 3Transplant outside: Jun 7 to Jun 14Sow outdoors: May 31 to Jun 14Plant for fall: Jun 29 to Jul 13
Start indoors: Apr 26 to May 3Sow outdoors: May 31 to Jun 14Plant for fall: Jul 6 to Jul 20
Start indoors: Apr 26 to May 3Sow outdoors: May 31 to Jun 14
Start indoors: Apr 26 to May 3Transplant outside: Jun 7 to Jun 21
Sow outdoors: May 3 to May 31Plant for fall: Jun 22 to Jul 6
Sow outdoors: May 3 to May 31Plant for fall: Jul 6 to Jul 20
Sow outdoors: May 3 to May 24
Sow outdoors: May 10 to Jun 7Plant for fall: Jul 6 to Jul 20
Sow outdoors: May 10 to May 31Plant for fall: Jul 20 to Aug 10
Sow outdoors: May 31 to Jun 21
Sow outdoors: May 31 to Jun 14
Transplant outside: Jun 7 to Jun 28
Plant for fall: Aug 31 to Oct 5
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Howe, ID
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 1 – Mar 15 | Apr 26 – May 10 | — | — |
| Peppers | Mar 15 – Mar 29 | Jun 7 – Jun 21 | — | — |
| Eggplant | Mar 15 – Mar 29 | Jun 7 – Jun 21 | — | — |
| Tomatoes | Mar 29 – Apr 12 | May 31 – Jun 14 | — | — |
| Lettuce | Mar 29 – Apr 12 | May 3 – May 17 | Apr 26 – May 31 | Jul 20 – Aug 17 |
| Kale | Mar 29 – Apr 12 | Apr 26 – May 10 | Apr 26 – May 10 | Jul 6 – Jul 27 |
| Broccoli | Mar 29 – Apr 12 | May 10 – May 24 | — | Jun 8 – Jun 29 |
| Cabbage | Mar 29 – Apr 12 | May 3 – May 17 | — | Jun 8 – Jun 29 |
| Cauliflower | Mar 29 – Apr 12 | May 10 – May 24 | — | Jun 8 – Jun 29 |
| Okra | Apr 12 – Apr 26 | Jun 14 – Jun 28 | Jun 14 – Jun 28 | — |
| Basil | Apr 12 – Apr 26 | May 31 – Jun 14 | — | — |
| Peas | — | — | Apr 12 – May 3 | Jun 22 – Jul 13 |
| Spinach | — | — | Apr 12 – May 3 | Jul 20 – Aug 10 |
| Radishes | — | — | Apr 19 – May 31 | Aug 3 – Aug 24 |
| Cucumbers | Apr 26 – May 3 | Jun 7 – Jun 14 | May 31 – Jun 14 | Jun 29 – Jul 13 |
| Zucchini & Summer Squash | Apr 26 – May 3 | — | May 31 – Jun 14 | Jul 6 – Jul 20 |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 113 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | Apr 26 – May 3 | — | May 31 – Jun 14 | — |
| Melons & Watermelon | Apr 26 – May 3 | Jun 7 – Jun 21 | — | — |
| Carrots | — | — | May 3 – May 31 | Jun 22 – Jul 6 |
| Beets | — | — | May 3 – May 31 | Jul 6 – Jul 20 |
| Potatoes | — | — | May 3 – May 24 | — |
| Swiss Chard | — | — | May 10 – Jun 7 | Jul 6 – Jul 20 |
| Cilantro | — | — | May 10 – May 31 | Jul 20 – Aug 10 |
| Green Beans | — | — | May 31 – Jun 21 | — |
| Sweet Corn | — | — | May 31 – Jun 14 | — |
| Sweet Potatoes Warning: Your frost-free season is about 113 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 7 – Jun 28 | — | — |
| Garlic | — | — | — | Aug 31 – Oct 5 |
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 Howe, ID weather station, 16 km away (elevation 4,820 ft (1,469 m)).
Frost dates near Howe
- Moore May 22 · Sep 22
- Arco May 22 · Sep 22
- Monteview Jun 12 · Sep 7
- Mackay Jun 1 · Sep 20
- Terreton Jun 3 · Sep 11
- Atomic City Jun 11 · Sep 6
- Dubois May 18 · Sep 30
- Hamer Jun 3 · Sep 11
- Roberts May 9 · Oct 5
- Spencer May 18 · Sep 30
Frequently asked questions
When is the last frost in Howe, ID?
The median last spring frost in Howe, ID is May 24. There is still about a 10% chance of frost after June 14, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Howe, ID?
The median first fall frost is September 14, with about a 10% chance of frost before September 1.
How long is the growing season in Howe, ID?
About 113 days between the median last spring frost and first fall frost.
What planting zone is Howe, ID?
Howe, ID is in USDA hardiness zone 5a.