North Fork, ID frost dates
Last spring frostJun 1median date
First fall frostSep 17median date
Growing season108 daysfrost-free
Hardiness zone6aZone 6a
How North Fork compares
- In 8 years out of 10, the last spring frost in North Fork falls between May 14 and June 19, a 36-day window. The first fall frost falls between September 2 and October 1.
- The median last frost is 18 days later than the Idaho median of May 14.
- Its 108-day growing season is longer than 15% of the 244 Idaho places with a regular frost season (state median 138 days).
- The last frost is 33 days later than the zone 6a median of Apr 29. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6a chart.
- The weather station records an average of 217 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 14 |
| 50% (median) | June 1 |
| 10% (safe for tender plants) | June 19 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 2 |
| 50% (median) | September 17 |
| 90% (late) | October 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 North Fork, ID
North Fork, ID frost dates — last frost Jun 1, first frost Sep 17, zone 6a. whenisthelastfrost.com
Crop
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Start indoors: Mar 9 to Mar 23Transplant outside: May 4 to May 18
Start indoors: Mar 23 to Apr 6Transplant outside: Jun 15 to Jun 29
Start indoors: Mar 23 to Apr 6Transplant outside: Jun 15 to Jun 29
Start indoors: Apr 6 to Apr 20Transplant outside: Jun 8 to Jun 22
Start indoors: Apr 6 to Apr 20Transplant outside: May 11 to May 25Sow outdoors: May 4 to Jun 8Plant for fall: Jul 23 to Aug 20
Start indoors: Apr 6 to Apr 20Transplant outside: May 4 to May 18Sow outdoors: May 4 to May 18Plant for fall: Jul 9 to Jul 30
Start indoors: Apr 6 to Apr 20Transplant outside: May 18 to Jun 1
Start indoors: Apr 6 to Apr 20Transplant outside: May 11 to May 25
Start indoors: Apr 6 to Apr 20Transplant outside: May 18 to Jun 1
Start indoors: Apr 20 to May 4Transplant outside: Jun 22 to Jul 6Sow outdoors: Jun 22 to Jul 6
Start indoors: Apr 20 to May 4Transplant outside: Jun 8 to Jun 22
Sow outdoors: Apr 20 to May 11Plant for fall: Jun 25 to Jul 16
Sow outdoors: Apr 20 to May 11Plant for fall: Jul 23 to Aug 13
Sow outdoors: Apr 27 to Jun 8Plant for fall: Aug 6 to Aug 27
Start indoors: May 4 to May 11Transplant outside: Jun 15 to Jun 22Sow outdoors: Jun 8 to Jun 22
Start indoors: May 4 to May 11Sow outdoors: Jun 8 to Jun 22Plant for fall: Jul 9 to Jul 23
Start indoors: May 4 to May 11Sow outdoors: Jun 8 to Jun 22
Start indoors: May 4 to May 11Transplant outside: Jun 15 to Jun 29
Sow outdoors: May 11 to Jun 8Plant for fall: Jun 25 to Jul 9
Sow outdoors: May 11 to Jun 8Plant for fall: Jul 9 to Jul 23
Sow outdoors: May 11 to Jun 1
Sow outdoors: May 18 to Jun 15Plant for fall: Jul 9 to Jul 23
Sow outdoors: May 18 to Jun 8Plant for fall: Jul 23 to Aug 13
Sow outdoors: Jun 8 to Jun 29
Sow outdoors: Jun 8 to Jun 22
Transplant outside: Jun 15 to Jul 6
Plant for fall: Sep 3 to Oct 8
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in North Fork, ID
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 9 – Mar 23 | May 4 – May 18 | — | — |
| Peppers | Mar 23 – Apr 6 | Jun 15 – Jun 29 | — | — |
| Eggplant | Mar 23 – Apr 6 | Jun 15 – Jun 29 | — | — |
| Tomatoes | Apr 6 – Apr 20 | Jun 8 – Jun 22 | — | — |
| Lettuce | Apr 6 – Apr 20 | May 11 – May 25 | May 4 – Jun 8 | Jul 23 – Aug 20 |
| Kale | Apr 6 – Apr 20 | May 4 – May 18 | May 4 – May 18 | Jul 9 – Jul 30 |
| Broccoli | Apr 6 – Apr 20 | May 18 – Jun 1 | — | — |
| Cabbage | Apr 6 – Apr 20 | May 11 – May 25 | — | — |
| Cauliflower | Apr 6 – Apr 20 | May 18 – Jun 1 | — | — |
| Okra | Apr 20 – May 4 | Jun 22 – Jul 6 | Jun 22 – Jul 6 | — |
| Basil | Apr 20 – May 4 | Jun 8 – Jun 22 | — | — |
| Peas | — | — | Apr 20 – May 11 | Jun 25 – Jul 16 |
| Spinach | — | — | Apr 20 – May 11 | Jul 23 – Aug 13 |
| Radishes | — | — | Apr 27 – Jun 8 | Aug 6 – Aug 27 |
| Cucumbers | May 4 – May 11 | Jun 15 – Jun 22 | Jun 8 – Jun 22 | — |
| Zucchini & Summer Squash | May 4 – May 11 | — | Jun 8 – Jun 22 | Jul 9 – Jul 23 |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 108 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 4 – May 11 | — | Jun 8 – Jun 22 | — |
| Melons & Watermelon | May 4 – May 11 | Jun 15 – Jun 29 | — | — |
| Carrots | — | — | May 11 – Jun 8 | Jun 25 – Jul 9 |
| Beets | — | — | May 11 – Jun 8 | Jul 9 – Jul 23 |
| Potatoes | — | — | May 11 – Jun 1 | — |
| Swiss Chard | — | — | May 18 – Jun 15 | Jul 9 – Jul 23 |
| Cilantro | — | — | May 18 – Jun 8 | Jul 23 – Aug 13 |
| Green Beans | — | — | Jun 8 – Jun 29 | — |
| Sweet Corn | — | — | Jun 8 – Jun 22 | — |
| Sweet Potatoes Warning: Your frost-free season is about 108 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 15 – Jul 6 | — | — |
| Garlic | — | — | — | Sep 3 – Oct 8 |
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 Gibbonsville #2, ID weather station, 16 km away (elevation 4,482 ft (1,366 m)).
Frost dates near North Fork
- Gibbonsville Jun 1 · Sep 17
- Shoup May 3 · Oct 8
- Carmen May 17 · Sep 24
- Salmon May 17 · Sep 24
- Cobalt May 17 · Sep 24
- Tendoy May 17 · Sep 24
- Lemhi frost any month
- Ellis Jun 12 · Sep 6
- Leadore frost any month
- May Jun 12 · Sep 6
Frequently asked questions
When is the last frost in North Fork, ID?
The median last spring frost in North Fork, ID is June 1. There is still about a 10% chance of frost after June 19, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in North Fork, ID?
The median first fall frost is September 17, with about a 10% chance of frost before September 2.
How long is the growing season in North Fork, ID?
About 108 days between the median last spring frost and first fall frost.
What planting zone is North Fork, ID?
North Fork, ID is in USDA hardiness zone 6a.