Malta, ID frost dates
Last spring frostJun 5median date
First fall frostSep 13median date
Growing season100 daysfrost-free
Hardiness zone6aZone 6a
How Malta compares
- In 8 years out of 10, the last spring frost in Malta falls between May 19 and June 23, a 35-day window. The first fall frost falls between August 28 and September 28.
- The median last frost is 22 days later than the Idaho median of May 14.
- Its 100-day growing season is longer than 11% of the 244 Idaho places with a regular frost season (state median 138 days).
- The last frost is 37 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 168 nights a year at or below 32°F.
- Compared with Pocatello, ID, 101 km away, the last frost here is 34 days later than there and the growing season is 62 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 19 |
| 50% (median) | June 5 |
| 10% (safe for tender plants) | June 23 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | August 28 |
| 50% (median) | September 13 |
| 90% (late) | September 28 |
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 Malta, ID
Malta, ID frost dates — last frost Jun 5, first frost Sep 13, zone 6a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 13 to Mar 27Transplant outside: May 8 to May 22
Start indoors: Mar 27 to Apr 10Transplant outside: Jun 19 to Jul 3
Start indoors: Mar 27 to Apr 10Transplant outside: Jun 19 to Jul 3
Start indoors: Apr 10 to Apr 24Transplant outside: Jun 12 to Jun 26
Start indoors: Apr 10 to Apr 24Transplant outside: May 15 to May 29Sow outdoors: May 8 to Jun 12Plant for fall: Jul 19 to Aug 16
Start indoors: Apr 10 to Apr 24Transplant outside: May 8 to May 22Sow outdoors: May 8 to May 22Plant for fall: Jul 5 to Jul 26
Start indoors: Apr 10 to Apr 24Transplant outside: May 22 to Jun 5
Start indoors: Apr 10 to Apr 24Transplant outside: May 15 to May 29
Start indoors: Apr 10 to Apr 24Transplant outside: May 22 to Jun 5
Start indoors: Apr 24 to May 8Transplant outside: Jun 26 to Jul 10Sow outdoors: Jun 26 to Jul 10
Start indoors: Apr 24 to May 8Transplant outside: Jun 12 to Jun 26
Sow outdoors: Apr 24 to May 15Plant for fall: Jun 21 to Jul 12
Sow outdoors: Apr 24 to May 15Plant for fall: Jul 19 to Aug 9
Sow outdoors: May 1 to Jun 12Plant for fall: Aug 2 to Aug 23
Start indoors: May 8 to May 15Transplant outside: Jun 19 to Jun 26Sow outdoors: Jun 12 to Jun 26
Start indoors: May 8 to May 15Sow outdoors: Jun 12 to Jun 26
Start indoors: May 8 to May 15Sow outdoors: Jun 12 to Jun 26
Start indoors: May 8 to May 15Transplant outside: Jun 19 to Jul 3
Sow outdoors: May 15 to Jun 12
Sow outdoors: May 15 to Jun 12Plant for fall: Jul 5 to Jul 19
Sow outdoors: May 15 to Jun 5
Sow outdoors: May 22 to Jun 19Plant for fall: Jul 5 to Jul 19
Sow outdoors: May 22 to Jun 12Plant for fall: Jul 19 to Aug 9
Sow outdoors: Jun 12 to Jul 3
Sow outdoors: Jun 12 to Jun 26
Transplant outside: Jun 19 to Jul 10
Plant for fall: Aug 30 to Oct 4
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Malta, ID
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 13 – Mar 27 | May 8 – May 22 | — | — |
| Peppers | Mar 27 – Apr 10 | Jun 19 – Jul 3 | — | — |
| Eggplant | Mar 27 – Apr 10 | Jun 19 – Jul 3 | — | — |
| Tomatoes | Apr 10 – Apr 24 | Jun 12 – Jun 26 | — | — |
| Lettuce | Apr 10 – Apr 24 | May 15 – May 29 | May 8 – Jun 12 | Jul 19 – Aug 16 |
| Kale | Apr 10 – Apr 24 | May 8 – May 22 | May 8 – May 22 | Jul 5 – Jul 26 |
| Broccoli | Apr 10 – Apr 24 | May 22 – Jun 5 | — | — |
| Cabbage | Apr 10 – Apr 24 | May 15 – May 29 | — | — |
| Cauliflower | Apr 10 – Apr 24 | May 22 – Jun 5 | — | — |
| Okra | Apr 24 – May 8 | Jun 26 – Jul 10 | Jun 26 – Jul 10 | — |
| Basil | Apr 24 – May 8 | Jun 12 – Jun 26 | — | — |
| Peas | — | — | Apr 24 – May 15 | Jun 21 – Jul 12 |
| Spinach | — | — | Apr 24 – May 15 | Jul 19 – Aug 9 |
| Radishes | — | — | May 1 – Jun 12 | Aug 2 – Aug 23 |
| Cucumbers | May 8 – May 15 | Jun 19 – Jun 26 | Jun 12 – Jun 26 | — |
| Zucchini & Summer Squash | May 8 – May 15 | — | Jun 12 – Jun 26 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 100 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 8 – May 15 | — | Jun 12 – Jun 26 | — |
| Melons & Watermelon | May 8 – May 15 | Jun 19 – Jul 3 | — | — |
| Carrots | — | — | May 15 – Jun 12 | — |
| Beets | — | — | May 15 – Jun 12 | Jul 5 – Jul 19 |
| Potatoes | — | — | May 15 – Jun 5 | — |
| Swiss Chard | — | — | May 22 – Jun 19 | Jul 5 – Jul 19 |
| Cilantro | — | — | May 22 – Jun 12 | Jul 19 – Aug 9 |
| Green Beans | — | — | Jun 12 – Jul 3 | — |
| Sweet Corn | — | — | Jun 12 – Jun 26 | — |
| Sweet Potatoes Warning: Your frost-free season is about 100 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 19 – Jul 10 | — | — |
| 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 Malta, ID weather station, 4 km away (elevation 4,521 ft (1,378 m)).
Frost dates near Malta
- Albion Jun 5 · Sep 13
- Declo May 16 · Oct 1
- Almo May 15 · Oct 2
- Oakley May 15 · Oct 2
- Burley May 7 · Oct 4
- Heyburn May 7 · Oct 4
- Rupert May 16 · Oct 1
- Paul May 6 · Oct 6
- Rockland May 20 · Sep 26
- American Falls May 20 · Sep 26
Frequently asked questions
When is the last frost in Malta, ID?
The median last spring frost in Malta, ID is June 5. There is still about a 10% chance of frost after June 23, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Malta, ID?
The median first fall frost is September 13, with about a 10% chance of frost before August 28.
How long is the growing season in Malta, ID?
About 100 days between the median last spring frost and first fall frost.
What planting zone is Malta, ID?
Malta, ID is in USDA hardiness zone 6a.