Pierce, ID frost dates
Last spring frostJun 3median date
First fall frostSep 7median date
Growing season96 daysfrost-free
Hardiness zone6aZone 6a
How Pierce compares
- In 8 years out of 10, the last spring frost in Pierce falls between May 17 and June 29, a 43-day window. The first fall frost falls between August 22 and September 26.
- The median last frost is 20 days later than the Idaho median of May 14.
- Its 96-day growing season is longer than 9% of the 244 Idaho places with a regular frost season (state median 138 days).
- The last frost is 35 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 216 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 17 |
| 50% (median) | June 3 |
| 10% (safe for tender plants) | June 29 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 22 |
| 50% (median) | September 7 |
| 90% (late) | September 26 |
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 Pierce, ID
Pierce, ID frost dates — last frost Jun 3, first frost Sep 7, zone 6a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 11 to Mar 25Transplant outside: May 6 to May 20
Start indoors: Mar 25 to Apr 8Transplant outside: Jun 17 to Jul 1
Start indoors: Mar 25 to Apr 8Transplant outside: Jun 17 to Jul 1
Start indoors: Apr 8 to Apr 22Transplant outside: Jun 10 to Jun 24
Start indoors: Apr 8 to Apr 22Transplant outside: May 13 to May 27Sow outdoors: May 6 to Jun 10Plant for fall: Jul 13 to Aug 10
Start indoors: Apr 8 to Apr 22Transplant outside: May 6 to May 20Sow outdoors: May 6 to May 20Plant for fall: Jun 29 to Jul 20
Start indoors: Apr 8 to Apr 22Transplant outside: May 20 to Jun 3
Start indoors: Apr 8 to Apr 22Transplant outside: May 13 to May 27
Start indoors: Apr 8 to Apr 22Transplant outside: May 20 to Jun 3
Start indoors: Apr 22 to May 6Transplant outside: Jun 24 to Jul 8Sow outdoors: Jun 24 to Jul 8
Start indoors: Apr 22 to May 6Transplant outside: Jun 10 to Jun 24
Sow outdoors: Apr 22 to May 13
Sow outdoors: Apr 22 to May 13Plant for fall: Jul 13 to Aug 3
Sow outdoors: Apr 29 to Jun 10Plant for fall: Jul 27 to Aug 17
Start indoors: May 6 to May 13Transplant outside: Jun 17 to Jun 24Sow outdoors: Jun 10 to Jun 24
Start indoors: May 6 to May 13Sow outdoors: Jun 10 to Jun 24
Start indoors: May 6 to May 13Sow outdoors: Jun 10 to Jun 24
Start indoors: May 6 to May 13Transplant outside: Jun 17 to Jul 1
Sow outdoors: May 13 to Jun 10
Sow outdoors: May 13 to Jun 10Plant for fall: Jun 29 to Jul 13
Sow outdoors: May 13 to Jun 3
Sow outdoors: May 20 to Jun 17
Sow outdoors: May 20 to Jun 10Plant for fall: Jul 13 to Aug 3
Sow outdoors: Jun 10 to Jul 1
Sow outdoors: Jun 10 to Jun 24
Transplant outside: Jun 17 to Jul 8
Plant for fall: Aug 24 to Sep 28
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Pierce, ID
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 11 – Mar 25 | May 6 – May 20 | — | — |
| Peppers | Mar 25 – Apr 8 | Jun 17 – Jul 1 | — | — |
| Eggplant | Mar 25 – Apr 8 | Jun 17 – Jul 1 | — | — |
| Tomatoes | Apr 8 – Apr 22 | Jun 10 – Jun 24 | — | — |
| Lettuce | Apr 8 – Apr 22 | May 13 – May 27 | May 6 – Jun 10 | Jul 13 – Aug 10 |
| Kale | Apr 8 – Apr 22 | May 6 – May 20 | May 6 – May 20 | Jun 29 – Jul 20 |
| Broccoli | Apr 8 – Apr 22 | May 20 – Jun 3 | — | — |
| Cabbage | Apr 8 – Apr 22 | May 13 – May 27 | — | — |
| Cauliflower | Apr 8 – Apr 22 | May 20 – Jun 3 | — | — |
| Okra | Apr 22 – May 6 | Jun 24 – Jul 8 | Jun 24 – Jul 8 | — |
| Basil | Apr 22 – May 6 | Jun 10 – Jun 24 | — | — |
| Peas | — | — | Apr 22 – May 13 | — |
| Spinach | — | — | Apr 22 – May 13 | Jul 13 – Aug 3 |
| Radishes | — | — | Apr 29 – Jun 10 | Jul 27 – Aug 17 |
| Cucumbers | May 6 – May 13 | Jun 17 – Jun 24 | Jun 10 – Jun 24 | — |
| Zucchini & Summer Squash | May 6 – May 13 | — | Jun 10 – Jun 24 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 96 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 6 – May 13 | — | Jun 10 – Jun 24 | — |
| Melons & Watermelon Warning: Your frost-free season is about 96 days, which is tight for melons & watermelon (85+ days). Choose early varieties and use transplants or row covers. | May 6 – May 13 | Jun 17 – Jul 1 | — | — |
| Carrots | — | — | May 13 – Jun 10 | — |
| Beets | — | — | May 13 – Jun 10 | Jun 29 – Jul 13 |
| Potatoes | — | — | May 13 – Jun 3 | — |
| Swiss Chard | — | — | May 20 – Jun 17 | — |
| Cilantro | — | — | May 20 – Jun 10 | Jul 13 – Aug 3 |
| Green Beans | — | — | Jun 10 – Jul 1 | — |
| Sweet Corn | — | — | Jun 10 – Jun 24 | — |
| Sweet Potatoes Warning: Your frost-free season is about 96 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 17 – Jul 8 | — | — |
| Garlic | — | — | — | Aug 24 – Sep 28 |
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 Pierce, ID weather station, about 1 km away (elevation 3,081 ft (939 m)).
Frost dates near Pierce
- Weippe Jun 3 · Sep 7
- Orofino Apr 20 · Oct 20
- Kamiah Apr 29 · Oct 5
- Ahsahka Apr 20 · Oct 20
- Nezperce May 24 · Sep 20
- Elk River May 16 · Sep 23
- Kooskia Apr 30 · Oct 11
- Peck Apr 20 · Oct 20
- Lenore Apr 20 · Oct 20
- Greencreek May 6 · Oct 13
Frequently asked questions
When is the last frost in Pierce, ID?
The median last spring frost in Pierce, ID is June 3. There is still about a 10% chance of frost after June 29, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Pierce, ID?
The median first fall frost is September 7, with about a 10% chance of frost before August 22.
How long is the growing season in Pierce, ID?
About 96 days between the median last spring frost and first fall frost.
What planting zone is Pierce, ID?
Pierce, ID is in USDA hardiness zone 6a.