Sugar City, ID frost dates
Last spring frostMay 29median date
First fall frostSep 13median date
Growing season107 daysfrost-free
Hardiness zone5aZone 5a
How Sugar City compares
- In 8 years out of 10, the last spring frost in Sugar City falls between May 12 and June 18, a 37-day window. The first fall frost falls between August 30 and October 1.
- The median last frost is 15 days later than the Idaho median of May 14.
- Its 107-day growing season is longer than 14% of the 244 Idaho places with a regular frost season (state median 138 days).
- The last frost is 26 days later than the zone 5a median of May 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5a chart.
- The weather station records an average of 193 nights a year at or below 32°F.
- Compared with Idaho Falls, ID, 47 km away, the last frost here is 20 days later than there and the growing season is 38 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 12 |
| 50% (median) | May 29 |
| 10% (safe for tender plants) | June 18 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 30 |
| 50% (median) | September 13 |
| 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 Sugar City, ID
Sugar City, ID frost dates — last frost May 29, first frost Sep 13, zone 5a. whenisthelastfrost.com
Crop
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Start indoors: Mar 6 to Mar 20Transplant outside: May 1 to May 15
Start indoors: Mar 20 to Apr 3Transplant outside: Jun 12 to Jun 26
Start indoors: Mar 20 to Apr 3Transplant outside: Jun 12 to Jun 26
Start indoors: Apr 3 to Apr 17Transplant outside: Jun 5 to Jun 19
Start indoors: Apr 3 to Apr 17Transplant outside: May 8 to May 22Sow outdoors: May 1 to Jun 5Plant for fall: Jul 19 to Aug 16
Start indoors: Apr 3 to Apr 17Transplant outside: May 1 to May 15Sow outdoors: May 1 to May 15Plant for fall: Jul 5 to Jul 26
Start indoors: Apr 3 to Apr 17Transplant outside: May 15 to May 29
Start indoors: Apr 3 to Apr 17Transplant outside: May 8 to May 22
Start indoors: Apr 3 to Apr 17Transplant outside: May 15 to May 29
Start indoors: Apr 17 to May 1Transplant outside: Jun 19 to Jul 3Sow outdoors: Jun 19 to Jul 3
Start indoors: Apr 17 to May 1Transplant outside: Jun 5 to Jun 19
Sow outdoors: Apr 17 to May 8Plant for fall: Jun 21 to Jul 12
Sow outdoors: Apr 17 to May 8Plant for fall: Jul 19 to Aug 9
Sow outdoors: Apr 24 to Jun 5Plant for fall: Aug 2 to Aug 23
Start indoors: May 1 to May 8Transplant outside: Jun 12 to Jun 19Sow outdoors: Jun 5 to Jun 19
Start indoors: May 1 to May 8Sow outdoors: Jun 5 to Jun 19Plant for fall: Jul 5 to Jul 19
Start indoors: May 1 to May 8Sow outdoors: Jun 5 to Jun 19
Start indoors: May 1 to May 8Transplant outside: Jun 12 to Jun 26
Sow outdoors: May 8 to Jun 5Plant for fall: Jun 21 to Jul 5
Sow outdoors: May 8 to Jun 5Plant for fall: Jul 5 to Jul 19
Sow outdoors: May 8 to May 29
Sow outdoors: May 15 to Jun 12Plant for fall: Jul 5 to Jul 19
Sow outdoors: May 15 to Jun 5Plant for fall: Jul 19 to Aug 9
Sow outdoors: Jun 5 to Jun 26
Sow outdoors: Jun 5 to Jun 19
Transplant outside: Jun 12 to Jul 3
Plant for fall: Aug 30 to Oct 4
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Sugar City, ID
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 6 – Mar 20 | May 1 – May 15 | — | — |
| Peppers | Mar 20 – Apr 3 | Jun 12 – Jun 26 | — | — |
| Eggplant | Mar 20 – Apr 3 | Jun 12 – Jun 26 | — | — |
| Tomatoes | Apr 3 – Apr 17 | Jun 5 – Jun 19 | — | — |
| Lettuce | Apr 3 – Apr 17 | May 8 – May 22 | May 1 – Jun 5 | Jul 19 – Aug 16 |
| Kale | Apr 3 – Apr 17 | May 1 – May 15 | May 1 – May 15 | Jul 5 – Jul 26 |
| Broccoli | Apr 3 – Apr 17 | May 15 – May 29 | — | — |
| Cabbage | Apr 3 – Apr 17 | May 8 – May 22 | — | — |
| Cauliflower | Apr 3 – Apr 17 | May 15 – May 29 | — | — |
| Okra | Apr 17 – May 1 | Jun 19 – Jul 3 | Jun 19 – Jul 3 | — |
| Basil | Apr 17 – May 1 | Jun 5 – Jun 19 | — | — |
| Peas | — | — | Apr 17 – May 8 | Jun 21 – Jul 12 |
| Spinach | — | — | Apr 17 – May 8 | Jul 19 – Aug 9 |
| Radishes | — | — | Apr 24 – Jun 5 | Aug 2 – Aug 23 |
| Cucumbers | May 1 – May 8 | Jun 12 – Jun 19 | Jun 5 – Jun 19 | — |
| Zucchini & Summer Squash | May 1 – May 8 | — | Jun 5 – Jun 19 | Jul 5 – Jul 19 |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 107 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 1 – May 8 | — | Jun 5 – Jun 19 | — |
| Melons & Watermelon | May 1 – May 8 | Jun 12 – Jun 26 | — | — |
| Carrots | — | — | May 8 – Jun 5 | Jun 21 – Jul 5 |
| Beets | — | — | May 8 – Jun 5 | Jul 5 – Jul 19 |
| Potatoes | — | — | May 8 – May 29 | — |
| Swiss Chard | — | — | May 15 – Jun 12 | Jul 5 – Jul 19 |
| Cilantro | — | — | May 15 – Jun 5 | Jul 19 – Aug 9 |
| Green Beans | — | — | Jun 5 – Jun 26 | — |
| Sweet Corn | — | — | Jun 5 – Jun 19 | — |
| Sweet Potatoes Warning: Your frost-free season is about 107 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 12 – Jul 3 | — | — |
| Garlic | — | — | — | Aug 30 – Oct 4 |
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 Sugar City, ID weather station, 6 km away (elevation 4,925 ft (1,501 m)).
Frost dates near Sugar City
- Teton May 29 · Sep 13
- Rexburg May 12 · Sep 24
- Newdale May 17 · Sep 22
- Saint Anthony May 17 · Sep 22
- Parker May 17 · Sep 22
- Chester May 21 · Sep 21
- Rigby May 9 · Oct 5
- Menan May 9 · Oct 5
- Ashton May 21 · Sep 21
- Lewisville May 9 · Oct 5
Frequently asked questions
When is the last frost in Sugar City, ID?
The median last spring frost in Sugar City, ID is May 29. There is still about a 10% chance of frost after June 18, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Sugar City, ID?
The median first fall frost is September 13, with about a 10% chance of frost before August 30.
How long is the growing season in Sugar City, ID?
About 107 days between the median last spring frost and first fall frost.
What planting zone is Sugar City, ID?
Sugar City, ID is in USDA hardiness zone 5a.