Declo, ID frost dates
Last spring frostMay 16median date
First fall frostOct 1median date
Growing season138 daysfrost-free
Hardiness zone6aZone 6a
How Declo compares
- In 8 years out of 10, the last spring frost in Declo falls between April 30 and June 5, a 36-day window. The first fall frost falls between September 13 and October 16.
- The median last frost is 2 days later than the Idaho median of May 14.
- Its 138-day growing season is longer than 50% of the 244 Idaho places with a regular frost season (state median 138 days).
- The last frost is 17 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 166 nights a year at or below 32°F.
- Compared with Pocatello, ID, 90 km away, the last frost here is 14 days later than there and the growing season is 24 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | April 30 |
| 50% (median) | May 16 |
| 10% (safe for tender plants) | June 5 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 13 |
| 50% (median) | October 1 |
| 90% (late) | October 16 |
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 Declo, ID
Declo, ID frost dates — last frost May 16, first frost Oct 1, zone 6a. whenisthelastfrost.com
Crop
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Start indoors: Feb 21 to Mar 7Transplant outside: Apr 18 to May 2
Start indoors: Mar 7 to Mar 21Transplant outside: May 30 to Jun 13
Start indoors: Mar 7 to Mar 21Transplant outside: May 30 to Jun 13
Start indoors: Mar 21 to Apr 4Transplant outside: May 23 to Jun 6
Start indoors: Mar 21 to Apr 4Transplant outside: Apr 25 to May 9Sow outdoors: Apr 18 to May 23Plant for fall: Aug 6 to Sep 3
Start indoors: Mar 21 to Apr 4Transplant outside: Apr 18 to May 2Sow outdoors: Apr 18 to May 2Plant for fall: Jul 23 to Aug 13
Start indoors: Mar 21 to Apr 4Transplant outside: May 2 to May 16Plant for fall: Jun 25 to Jul 16
Start indoors: Mar 21 to Apr 4Transplant outside: Apr 25 to May 9Plant for fall: Jun 25 to Jul 16
Start indoors: Mar 21 to Apr 4Transplant outside: May 2 to May 16Plant for fall: Jun 25 to Jul 16
Start indoors: Apr 4 to Apr 18Transplant outside: Jun 6 to Jun 20Sow outdoors: Jun 6 to Jun 20
Start indoors: Apr 4 to Apr 18Transplant outside: May 23 to Jun 6
Sow outdoors: Apr 4 to Apr 25Plant for fall: Jul 9 to Jul 30
Sow outdoors: Apr 4 to Apr 25Plant for fall: Aug 6 to Aug 27
Sow outdoors: Apr 11 to May 23Plant for fall: Aug 20 to Sep 10
Start indoors: Apr 18 to Apr 25Transplant outside: May 30 to Jun 6Sow outdoors: May 23 to Jun 6Plant for fall: Jul 16 to Jul 30
Start indoors: Apr 18 to Apr 25Sow outdoors: May 23 to Jun 6Plant for fall: Jul 23 to Aug 6
Start indoors: Apr 18 to Apr 25Sow outdoors: May 23 to Jun 6
Start indoors: Apr 18 to Apr 25Transplant outside: May 30 to Jun 13
Sow outdoors: Apr 25 to May 23Plant for fall: Jul 9 to Jul 23
Sow outdoors: Apr 25 to May 23Plant for fall: Jul 23 to Aug 6
Sow outdoors: Apr 25 to May 16
Sow outdoors: May 2 to May 30Plant for fall: Jul 23 to Aug 6
Sow outdoors: May 2 to May 23Plant for fall: Aug 6 to Aug 27
Sow outdoors: May 23 to Jun 13Plant for fall: Jul 16 to Jul 30
Sow outdoors: May 23 to Jun 6
Transplant outside: May 30 to Jun 20
Plant for fall: Sep 17 to Oct 22
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Declo, ID
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 21 – Mar 7 | Apr 18 – May 2 | — | — |
| Peppers | Mar 7 – Mar 21 | May 30 – Jun 13 | — | — |
| Eggplant | Mar 7 – Mar 21 | May 30 – Jun 13 | — | — |
| Tomatoes | Mar 21 – Apr 4 | May 23 – Jun 6 | — | — |
| Lettuce | Mar 21 – Apr 4 | Apr 25 – May 9 | Apr 18 – May 23 | Aug 6 – Sep 3 |
| Kale | Mar 21 – Apr 4 | Apr 18 – May 2 | Apr 18 – May 2 | Jul 23 – Aug 13 |
| Broccoli | Mar 21 – Apr 4 | May 2 – May 16 | — | Jun 25 – Jul 16 |
| Cabbage | Mar 21 – Apr 4 | Apr 25 – May 9 | — | Jun 25 – Jul 16 |
| Cauliflower | Mar 21 – Apr 4 | May 2 – May 16 | — | Jun 25 – Jul 16 |
| Okra | Apr 4 – Apr 18 | Jun 6 – Jun 20 | Jun 6 – Jun 20 | — |
| Basil | Apr 4 – Apr 18 | May 23 – Jun 6 | — | — |
| Peas | — | — | Apr 4 – Apr 25 | Jul 9 – Jul 30 |
| Spinach | — | — | Apr 4 – Apr 25 | Aug 6 – Aug 27 |
| Radishes | — | — | Apr 11 – May 23 | Aug 20 – Sep 10 |
| Cucumbers | Apr 18 – Apr 25 | May 30 – Jun 6 | May 23 – Jun 6 | Jul 16 – Jul 30 |
| Zucchini & Summer Squash | Apr 18 – Apr 25 | — | May 23 – Jun 6 | Jul 23 – Aug 6 |
| Winter Squash & Pumpkins | Apr 18 – Apr 25 | — | May 23 – Jun 6 | — |
| Melons & Watermelon | Apr 18 – Apr 25 | May 30 – Jun 13 | — | — |
| Carrots | — | — | Apr 25 – May 23 | Jul 9 – Jul 23 |
| Beets | — | — | Apr 25 – May 23 | Jul 23 – Aug 6 |
| Potatoes | — | — | Apr 25 – May 16 | — |
| Swiss Chard | — | — | May 2 – May 30 | Jul 23 – Aug 6 |
| Cilantro | — | — | May 2 – May 23 | Aug 6 – Aug 27 |
| Green Beans | — | — | May 23 – Jun 13 | Jul 16 – Jul 30 |
| Sweet Corn | — | — | May 23 – Jun 6 | — |
| Sweet Potatoes | — | May 30 – Jun 20 | — | — |
| Garlic | — | — | — | Sep 17 – Oct 22 |
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 Minidoka Dam, ID weather station, 18 km away (elevation 4,163 ft (1,269 m)).
Frost dates near Declo
- Albion Jun 5 · Sep 13
- Rupert May 16 · Oct 1
- Heyburn May 7 · Oct 4
- Malta Jun 5 · Sep 13
- Minidoka May 16 · Oct 1
- Burley May 7 · Oct 4
- Paul May 6 · Oct 6
- American Falls May 20 · Sep 26
- Rockland May 20 · Sep 26
- Almo May 15 · Oct 2
Frequently asked questions
When is the last frost in Declo, ID?
The median last spring frost in Declo, ID is May 16. There is still about a 10% chance of frost after June 5, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Declo, ID?
The median first fall frost is October 1, with about a 10% chance of frost before September 13.
How long is the growing season in Declo, ID?
About 138 days between the median last spring frost and first fall frost.
What planting zone is Declo, ID?
Declo, ID is in USDA hardiness zone 6a.