Plummer, ID frost dates
Last spring frostMay 11median date
First fall frostOct 5median date
Growing season147 daysfrost-free
Hardiness zone6bZone 6b
How Plummer compares
- In 8 years out of 10, the last spring frost in Plummer falls between April 25 and June 4, a 40-day window. The first fall frost falls between September 15 and October 21.
- The median last frost is 3 days earlier than the Idaho median of May 14.
- Its 147-day growing season is longer than 59% of the 244 Idaho places with a regular frost season (state median 138 days).
- The last frost is 19 days later than the zone 6b median of Apr 22. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6b chart.
- The weather station records an average of 158 nights a year at or below 32°F.
- Compared with Spokane, WA, 55 km away, the last frost here is 15 days later than there and the growing season is 25 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 25 |
| 50% (median) | May 11 |
| 10% (safe for tender plants) | June 4 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 15 |
| 50% (median) | October 5 |
| 90% (late) | October 21 |
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 Plummer, ID
Plummer, ID frost dates — last frost May 11, first frost Oct 5, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Feb 16 to Mar 2Transplant outside: Apr 13 to Apr 27
Start indoors: Mar 2 to Mar 16Transplant outside: May 25 to Jun 8
Start indoors: Mar 2 to Mar 16Transplant outside: May 25 to Jun 8
Start indoors: Mar 16 to Mar 30Transplant outside: May 18 to Jun 1
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 20 to May 4Sow outdoors: Apr 13 to May 18Plant for fall: Aug 10 to Sep 7
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 13 to Apr 27Sow outdoors: Apr 13 to Apr 27Plant for fall: Jul 27 to Aug 17
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 27 to May 11Plant for fall: Jun 29 to Jul 20
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 20 to May 4Plant for fall: Jun 29 to Jul 20
Start indoors: Mar 16 to Mar 30Transplant outside: Apr 27 to May 11Plant for fall: Jun 29 to Jul 20
Start indoors: Mar 30 to Apr 13Transplant outside: Jun 1 to Jun 15Sow outdoors: Jun 1 to Jun 15
Start indoors: Mar 30 to Apr 13Transplant outside: May 18 to Jun 1
Sow outdoors: Mar 30 to Apr 20Plant for fall: Jul 13 to Aug 3
Sow outdoors: Mar 30 to Apr 20Plant for fall: Aug 10 to Aug 31
Sow outdoors: Apr 6 to May 18Plant for fall: Aug 24 to Sep 14
Start indoors: Apr 13 to Apr 20Transplant outside: May 25 to Jun 1Sow outdoors: May 18 to Jun 1Plant for fall: Jul 20 to Aug 3
Start indoors: Apr 13 to Apr 20Sow outdoors: May 18 to Jun 1Plant for fall: Jul 27 to Aug 10
Start indoors: Apr 13 to Apr 20Sow outdoors: May 18 to Jun 1
Start indoors: Apr 13 to Apr 20Transplant outside: May 25 to Jun 8
Sow outdoors: Apr 20 to May 18Plant for fall: Jul 13 to Jul 27
Sow outdoors: Apr 20 to May 18Plant for fall: Jul 27 to Aug 10
Sow outdoors: Apr 20 to May 11
Sow outdoors: Apr 27 to May 25Plant for fall: Jul 27 to Aug 10
Sow outdoors: Apr 27 to May 18Plant for fall: Aug 10 to Aug 31
Sow outdoors: May 18 to Jun 8Plant for fall: Jul 20 to Aug 3
Sow outdoors: May 18 to Jun 1
Transplant outside: May 25 to Jun 15
Plant for fall: Sep 21 to Oct 26
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Plummer, ID
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 16 – Mar 2 | Apr 13 – Apr 27 | — | — |
| Peppers | Mar 2 – Mar 16 | May 25 – Jun 8 | — | — |
| Eggplant | Mar 2 – Mar 16 | May 25 – Jun 8 | — | — |
| Tomatoes | Mar 16 – Mar 30 | May 18 – Jun 1 | — | — |
| Lettuce | Mar 16 – Mar 30 | Apr 20 – May 4 | Apr 13 – May 18 | Aug 10 – Sep 7 |
| Kale | Mar 16 – Mar 30 | Apr 13 – Apr 27 | Apr 13 – Apr 27 | Jul 27 – Aug 17 |
| Broccoli | Mar 16 – Mar 30 | Apr 27 – May 11 | — | Jun 29 – Jul 20 |
| Cabbage | Mar 16 – Mar 30 | Apr 20 – May 4 | — | Jun 29 – Jul 20 |
| Cauliflower | Mar 16 – Mar 30 | Apr 27 – May 11 | — | Jun 29 – Jul 20 |
| Okra | Mar 30 – Apr 13 | Jun 1 – Jun 15 | Jun 1 – Jun 15 | — |
| Basil | Mar 30 – Apr 13 | May 18 – Jun 1 | — | — |
| Peas | — | — | Mar 30 – Apr 20 | Jul 13 – Aug 3 |
| Spinach | — | — | Mar 30 – Apr 20 | Aug 10 – Aug 31 |
| Radishes | — | — | Apr 6 – May 18 | Aug 24 – Sep 14 |
| Cucumbers | Apr 13 – Apr 20 | May 25 – Jun 1 | May 18 – Jun 1 | Jul 20 – Aug 3 |
| Zucchini & Summer Squash | Apr 13 – Apr 20 | — | May 18 – Jun 1 | Jul 27 – Aug 10 |
| Winter Squash & Pumpkins | Apr 13 – Apr 20 | — | May 18 – Jun 1 | — |
| Melons & Watermelon | Apr 13 – Apr 20 | May 25 – Jun 8 | — | — |
| Carrots | — | — | Apr 20 – May 18 | Jul 13 – Jul 27 |
| Beets | — | — | Apr 20 – May 18 | Jul 27 – Aug 10 |
| Potatoes | — | — | Apr 20 – May 11 | — |
| Swiss Chard | — | — | Apr 27 – May 25 | Jul 27 – Aug 10 |
| Cilantro | — | — | Apr 27 – May 18 | Aug 10 – Aug 31 |
| Green Beans | — | — | May 18 – Jun 8 | Jul 20 – Aug 3 |
| Sweet Corn | — | — | May 18 – Jun 1 | — |
| Sweet Potatoes | — | May 25 – Jun 15 | — | — |
| Garlic | — | — | — | Sep 21 – Oct 26 |
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 Plummer 3 Wsw, ID weather station, 7 km away (elevation 2,904 ft (885 m)).
Frost dates near Plummer
- Worley May 11 · Oct 5
- Tensed May 11 · Oct 5
- Harrison Apr 22 · Oct 18
- Desmet May 15 · Sep 21
- Saint Maries May 3 · Oct 4
- Medimont May 3 · Oct 4
- Santa May 3 · Oct 4
- Cataldo May 14 · Sep 26
- Coeur d'Alene Apr 22 · Oct 18
- Potlatch May 15 · Sep 21
Frequently asked questions
When is the last frost in Plummer, ID?
The median last spring frost in Plummer, ID is May 11. There is still about a 10% chance of frost after June 4, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Plummer, ID?
The median first fall frost is October 5, with about a 10% chance of frost before September 15.
How long is the growing season in Plummer, ID?
About 147 days between the median last spring frost and first fall frost.
What planting zone is Plummer, ID?
Plummer, ID is in USDA hardiness zone 6b.