Atomic City, ID frost dates
Last spring frostJun 11median date
First fall frostSep 6median date
Growing season87 daysfrost-free
Hardiness zone—
How Atomic City compares
- In 8 years out of 10, the last spring frost in Atomic City falls between May 20 and July 1, a 42-day window. The first fall frost falls between August 24 and September 21.
- The median last frost is 28 days later than the Idaho median of May 14.
- Its 87-day growing season is longer than 5% of the 244 Idaho places with a regular frost season (state median 138 days).
- The weather station records an average of 208 nights a year at or below 32°F.
- Compared with Idaho Falls, ID, 65 km away, the last frost here is 33 days later than there and the growing season is 58 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 20 |
| 50% (median) | June 11 |
| 10% (safe for tender plants) | July 1 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 24 |
| 50% (median) | September 6 |
| 90% (late) | September 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 Atomic City, ID
Atomic City, ID frost dates — last frost Jun 11, first frost Sep 6, zone n/a. whenisthelastfrost.com
Crop
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Start indoors: Mar 19 to Apr 2Transplant outside: May 14 to May 28
Start indoors: Apr 2 to Apr 16Transplant outside: Jun 25 to Jul 9
Start indoors: Apr 2 to Apr 16Transplant outside: Jun 25 to Jul 9
Start indoors: Apr 16 to Apr 30Transplant outside: Jun 18 to Jul 2
Start indoors: Apr 16 to Apr 30Transplant outside: May 21 to Jun 4Sow outdoors: May 14 to Jun 18Plant for fall: Jul 12 to Aug 9
Start indoors: Apr 16 to Apr 30Transplant outside: May 14 to May 28Sow outdoors: May 14 to May 28Plant for fall: Jun 28 to Jul 19
Start indoors: Apr 16 to Apr 30Transplant outside: May 28 to Jun 11
Start indoors: Apr 16 to Apr 30Transplant outside: May 21 to Jun 4
Start indoors: Apr 16 to Apr 30Transplant outside: May 28 to Jun 11
Start indoors: Apr 30 to May 14Transplant outside: Jul 2 to Jul 16Sow outdoors: Jul 2 to Jul 16
Start indoors: Apr 30 to May 14Transplant outside: Jun 18 to Jul 2
Sow outdoors: Apr 30 to May 21
Sow outdoors: Apr 30 to May 21Plant for fall: Jul 12 to Aug 2
Sow outdoors: May 7 to Jun 18Plant for fall: Jul 26 to Aug 16
Start indoors: May 14 to May 21Transplant outside: Jun 25 to Jul 2Sow outdoors: Jun 18 to Jul 2
Start indoors: May 14 to May 21Sow outdoors: Jun 18 to Jul 2
Start indoors: May 14 to May 21Sow outdoors: Jun 18 to Jul 2
Start indoors: May 14 to May 21Transplant outside: Jun 25 to Jul 9
Sow outdoors: May 21 to Jun 18
Sow outdoors: May 21 to Jun 18
Sow outdoors: May 21 to Jun 11
Sow outdoors: May 28 to Jun 25
Sow outdoors: May 28 to Jun 18Plant for fall: Jul 12 to Aug 2
Sow outdoors: Jun 18 to Jul 9
Sow outdoors: Jun 18 to Jul 2
Transplant outside: Jun 25 to Jul 16
Plant for fall: Aug 23 to Sep 27
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Atomic City, ID
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 19 – Apr 2 | May 14 – May 28 | — | — |
| Peppers Warning: Your frost-free season is about 87 days, which is tight for peppers (75+ days). Choose early varieties and use transplants or row covers. | Apr 2 – Apr 16 | Jun 25 – Jul 9 | — | — |
| Eggplant Warning: Your frost-free season is about 87 days, which is tight for eggplant (75+ days). Choose early varieties and use transplants or row covers. | Apr 2 – Apr 16 | Jun 25 – Jul 9 | — | — |
| Tomatoes | Apr 16 – Apr 30 | Jun 18 – Jul 2 | — | — |
| Lettuce | Apr 16 – Apr 30 | May 21 – Jun 4 | May 14 – Jun 18 | Jul 12 – Aug 9 |
| Kale | Apr 16 – Apr 30 | May 14 – May 28 | May 14 – May 28 | Jun 28 – Jul 19 |
| Broccoli | Apr 16 – Apr 30 | May 28 – Jun 11 | — | — |
| Cabbage | Apr 16 – Apr 30 | May 21 – Jun 4 | — | — |
| Cauliflower | Apr 16 – Apr 30 | May 28 – Jun 11 | — | — |
| Okra | Apr 30 – May 14 | Jul 2 – Jul 16 | Jul 2 – Jul 16 | — |
| Basil | Apr 30 – May 14 | Jun 18 – Jul 2 | — | — |
| Peas | — | — | Apr 30 – May 21 | — |
| Spinach | — | — | Apr 30 – May 21 | Jul 12 – Aug 2 |
| Radishes | — | — | May 7 – Jun 18 | Jul 26 – Aug 16 |
| Cucumbers | May 14 – May 21 | Jun 25 – Jul 2 | Jun 18 – Jul 2 | — |
| Zucchini & Summer Squash | May 14 – May 21 | — | Jun 18 – Jul 2 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 87 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 14 – May 21 | — | Jun 18 – Jul 2 | — |
| Melons & Watermelon Warning: Your frost-free season is about 87 days, which is tight for melons & watermelon (85+ days). Choose early varieties and use transplants or row covers. | May 14 – May 21 | Jun 25 – Jul 9 | — | — |
| Carrots | — | — | May 21 – Jun 18 | — |
| Beets | — | — | May 21 – Jun 18 | — |
| Potatoes | — | — | May 21 – Jun 11 | — |
| Swiss Chard | — | — | May 28 – Jun 25 | — |
| Cilantro | — | — | May 28 – Jun 18 | Jul 12 – Aug 2 |
| Green Beans | — | — | Jun 18 – Jul 9 | — |
| Sweet Corn Warning: Your frost-free season is about 87 days, which is tight for sweet corn (80+ days). Choose early varieties and use transplants or row covers. | — | — | Jun 18 – Jul 2 | — |
| Sweet Potatoes Warning: Your frost-free season is about 87 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 25 – Jul 16 | — | — |
| Garlic | — | — | — | Aug 23 – Sep 27 |
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 Idaho Falls 46 W, ID weather station, 14 km away (elevation 4,938 ft (1,505 m)).
Frost dates near Atomic City
- Pingree May 20 · Sep 20
- Moreland May 5 · Oct 3
- Springfield May 21 · Sep 20
- Arco May 22 · Sep 22
- Blackfoot May 5 · Oct 3
- Aberdeen May 21 · Sep 20
- Basalt May 5 · Oct 3
- Firth May 5 · Oct 3
- Fort Hall May 20 · Sep 20
- Terreton Jun 3 · Sep 11
Frequently asked questions
When is the last frost in Atomic City, ID?
The median last spring frost in Atomic City, ID is June 11. There is still about a 10% chance of frost after July 1, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Atomic City, ID?
The median first fall frost is September 6, with about a 10% chance of frost before August 24.
How long is the growing season in Atomic City, ID?
About 87 days between the median last spring frost and first fall frost.
What planting zone is Atomic City, ID?
Zone data is not available for this location.