Springfield, ID frost dates
Last spring frostMay 21median date
First fall frostSep 20median date
Growing season122 daysfrost-free
Hardiness zone5bZone 5b
How Springfield compares
- In 8 years out of 10, the last spring frost in Springfield falls between May 4 and June 13, a 40-day window. The first fall frost falls between September 2 and October 4.
- The median last frost is 7 days later than the Idaho median of May 14.
- Its 122-day growing season is longer than 21% of the 244 Idaho places with a regular frost season (state median 138 days).
- The last frost is 20 days later than the zone 5b median of May 1. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5b chart.
- The weather station records an average of 196 nights a year at or below 32°F.
- Compared with Pocatello, ID, 35 km away, the last frost here is 19 days later than there and the growing season is 40 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 4 |
| 50% (median) | May 21 |
| 10% (safe for tender plants) | June 13 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 2 |
| 50% (median) | September 20 |
| 90% (late) | October 4 |
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 Springfield, ID
Springfield, ID frost dates — last frost May 21, first frost Sep 20, zone 5b. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 23 to May 7
Start indoors: Mar 12 to Mar 26Transplant outside: Jun 4 to Jun 18
Start indoors: Mar 12 to Mar 26Transplant outside: Jun 4 to Jun 18
Start indoors: Mar 26 to Apr 9Transplant outside: May 28 to Jun 11
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 30 to May 14Sow outdoors: Apr 23 to May 28Plant for fall: Jul 26 to Aug 23
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 23 to May 7Sow outdoors: Apr 23 to May 7Plant for fall: Jul 12 to Aug 2
Start indoors: Mar 26 to Apr 9Transplant outside: May 7 to May 21Plant for fall: Jun 14 to Jul 5
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 30 to May 14Plant for fall: Jun 14 to Jul 5
Start indoors: Mar 26 to Apr 9Transplant outside: May 7 to May 21Plant for fall: Jun 14 to Jul 5
Start indoors: Apr 9 to Apr 23Transplant outside: Jun 11 to Jun 25Sow outdoors: Jun 11 to Jun 25
Start indoors: Apr 9 to Apr 23Transplant outside: May 28 to Jun 11
Sow outdoors: Apr 9 to Apr 30Plant for fall: Jun 28 to Jul 19
Sow outdoors: Apr 9 to Apr 30Plant for fall: Jul 26 to Aug 16
Sow outdoors: Apr 16 to May 28Plant for fall: Aug 9 to Aug 30
Start indoors: Apr 23 to Apr 30Transplant outside: Jun 4 to Jun 11Sow outdoors: May 28 to Jun 11Plant for fall: Jul 5 to Jul 19
Start indoors: Apr 23 to Apr 30Sow outdoors: May 28 to Jun 11Plant for fall: Jul 12 to Jul 26
Start indoors: Apr 23 to Apr 30Sow outdoors: May 28 to Jun 11
Start indoors: Apr 23 to Apr 30Transplant outside: Jun 4 to Jun 18
Sow outdoors: Apr 30 to May 28Plant for fall: Jun 28 to Jul 12
Sow outdoors: Apr 30 to May 28Plant for fall: Jul 12 to Jul 26
Sow outdoors: Apr 30 to May 21
Sow outdoors: May 7 to Jun 4Plant for fall: Jul 12 to Jul 26
Sow outdoors: May 7 to May 28Plant for fall: Jul 26 to Aug 16
Sow outdoors: May 28 to Jun 18Plant for fall: Jul 5 to Jul 19
Sow outdoors: May 28 to Jun 11
Transplant outside: Jun 4 to Jun 25
Plant for fall: Sep 6 to Oct 11
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Springfield, ID
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 26 – Mar 12 | Apr 23 – May 7 | — | — |
| Peppers | Mar 12 – Mar 26 | Jun 4 – Jun 18 | — | — |
| Eggplant | Mar 12 – Mar 26 | Jun 4 – Jun 18 | — | — |
| Tomatoes | Mar 26 – Apr 9 | May 28 – Jun 11 | — | — |
| Lettuce | Mar 26 – Apr 9 | Apr 30 – May 14 | Apr 23 – May 28 | Jul 26 – Aug 23 |
| Kale | Mar 26 – Apr 9 | Apr 23 – May 7 | Apr 23 – May 7 | Jul 12 – Aug 2 |
| Broccoli | Mar 26 – Apr 9 | May 7 – May 21 | — | Jun 14 – Jul 5 |
| Cabbage | Mar 26 – Apr 9 | Apr 30 – May 14 | — | Jun 14 – Jul 5 |
| Cauliflower | Mar 26 – Apr 9 | May 7 – May 21 | — | Jun 14 – Jul 5 |
| Okra | Apr 9 – Apr 23 | Jun 11 – Jun 25 | Jun 11 – Jun 25 | — |
| Basil | Apr 9 – Apr 23 | May 28 – Jun 11 | — | — |
| Peas | — | — | Apr 9 – Apr 30 | Jun 28 – Jul 19 |
| Spinach | — | — | Apr 9 – Apr 30 | Jul 26 – Aug 16 |
| Radishes | — | — | Apr 16 – May 28 | Aug 9 – Aug 30 |
| Cucumbers | Apr 23 – Apr 30 | Jun 4 – Jun 11 | May 28 – Jun 11 | Jul 5 – Jul 19 |
| Zucchini & Summer Squash | Apr 23 – Apr 30 | — | May 28 – Jun 11 | Jul 12 – Jul 26 |
| Winter Squash & Pumpkins | Apr 23 – Apr 30 | — | May 28 – Jun 11 | — |
| Melons & Watermelon | Apr 23 – Apr 30 | Jun 4 – Jun 18 | — | — |
| Carrots | — | — | Apr 30 – May 28 | Jun 28 – Jul 12 |
| Beets | — | — | Apr 30 – May 28 | Jul 12 – Jul 26 |
| Potatoes | — | — | Apr 30 – May 21 | — |
| Swiss Chard | — | — | May 7 – Jun 4 | Jul 12 – Jul 26 |
| Cilantro | — | — | May 7 – May 28 | Jul 26 – Aug 16 |
| Green Beans | — | — | May 28 – Jun 18 | Jul 5 – Jul 19 |
| Sweet Corn | — | — | May 28 – Jun 11 | — |
| Sweet Potatoes | — | Jun 4 – Jun 25 | — | — |
| Garlic | — | — | — | Sep 6 – Oct 11 |
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 Aberdeen Exp Stn, ID weather station, 19 km away (elevation 4,406 ft (1,343 m)).
Frost dates near Springfield
- Pingree May 20 · Sep 20
- Aberdeen May 21 · Sep 20
- Fort Hall May 20 · Sep 20
- Moreland May 5 · Oct 3
- Blackfoot May 5 · Oct 3
- Pocatello May 2 · Oct 11
- Atomic City Jun 11 · Sep 6
- Inkom May 23 · Sep 24
- Firth May 5 · Oct 3
- Basalt May 5 · Oct 3
Frequently asked questions
When is the last frost in Springfield, ID?
The median last spring frost in Springfield, ID is May 21. There is still about a 10% chance of frost after June 13, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Springfield, ID?
The median first fall frost is September 20, with about a 10% chance of frost before September 2.
How long is the growing season in Springfield, ID?
About 122 days between the median last spring frost and first fall frost.
What planting zone is Springfield, ID?
Springfield, ID is in USDA hardiness zone 5b.