Coolidge, AZ frost dates
Last spring frostFeb 17median date
First fall frostNov 29median date
Growing season285 daysfrost-free
Hardiness zone9aZone 9a
How Coolidge compares
- In 8 years out of 10, the last spring frost in Coolidge falls between January 22 and March 8, a 45-day window. The first fall frost falls between November 12 and December 15.
- The median last frost is 58 days earlier than the Arizona median of Apr 16.
- Its 285-day growing season is longer than 96% of the 193 Arizona places with a regular frost season (state median 197 days).
- The last frost is 14 days earlier than the zone 9a median of Mar 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 9a chart.
- The weather station records an average of 29 nights a year at or below 32°F.
- Nearby Casa Grande, AZ, 20 km away, gets only light, occasional frost, a reminder of how much elevation and distance from the coast matter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | January 22 |
| 50% (median) | February 17 |
| 10% (safe for tender plants) | March 8 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 12 |
| 50% (median) | November 29 |
| 90% (late) | December 15 |
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 Coolidge, AZ
Coolidge, AZ frost dates — last frost Feb 17, first frost Nov 29, zone 9a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Nov 25 to Dec 9Transplant outside: Jan 20 to Feb 3
Start indoors: Dec 9 to Dec 23Transplant outside: Mar 3 to Mar 17
Start indoors: Dec 9 to Dec 23Transplant outside: Mar 3 to Mar 17
Start indoors: Dec 23 to Jan 6Start indoors: Dec 23 to Jan 6Transplant outside: Feb 24 to Mar 10
Start indoors: Dec 23 to Jan 6Start indoors: Dec 23 to Jan 6Transplant outside: Jan 27 to Feb 10Sow outdoors: Jan 20 to Feb 24Plant for fall: Oct 4 to Nov 1
Start indoors: Dec 23 to Jan 6Start indoors: Dec 23 to Jan 6Transplant outside: Jan 20 to Feb 3Sow outdoors: Jan 20 to Feb 3Plant for fall: Sep 20 to Oct 11
Start indoors: Dec 23 to Jan 6Start indoors: Dec 23 to Jan 6Transplant outside: Feb 3 to Feb 17Plant for fall: Aug 23 to Sep 13
Start indoors: Dec 23 to Jan 6Start indoors: Dec 23 to Jan 6Transplant outside: Jan 27 to Feb 10Plant for fall: Aug 23 to Sep 13
Start indoors: Dec 23 to Jan 6Start indoors: Dec 23 to Jan 6Transplant outside: Feb 3 to Feb 17Plant for fall: Aug 23 to Sep 13
Start indoors: Jan 6 to Jan 20Transplant outside: Mar 10 to Mar 24Sow outdoors: Mar 10 to Mar 24
Start indoors: Jan 6 to Jan 20Transplant outside: Feb 24 to Mar 10
Sow outdoors: Jan 6 to Jan 27Plant for fall: Sep 6 to Sep 27
Sow outdoors: Jan 6 to Jan 27Plant for fall: Oct 4 to Oct 25
Sow outdoors: Jan 13 to Feb 24Plant for fall: Oct 18 to Nov 8
Start indoors: Jan 20 to Jan 27Transplant outside: Mar 3 to Mar 10Sow outdoors: Feb 24 to Mar 10Plant for fall: Sep 13 to Sep 27
Start indoors: Jan 20 to Jan 27Sow outdoors: Feb 24 to Mar 10Plant for fall: Sep 20 to Oct 4
Start indoors: Jan 20 to Jan 27Sow outdoors: Feb 24 to Mar 10
Start indoors: Jan 20 to Jan 27Transplant outside: Mar 3 to Mar 17
Sow outdoors: Jan 27 to Feb 24Plant for fall: Sep 6 to Sep 20
Sow outdoors: Jan 27 to Feb 24Plant for fall: Sep 20 to Oct 4
Sow outdoors: Jan 27 to Feb 17
Sow outdoors: Feb 3 to Mar 3Plant for fall: Sep 20 to Oct 4
Sow outdoors: Feb 3 to Feb 24Plant for fall: Oct 4 to Oct 25
Sow outdoors: Feb 24 to Mar 17Plant for fall: Sep 13 to Sep 27
Sow outdoors: Feb 24 to Mar 10
Transplant outside: Mar 3 to Mar 24
Plant for fall: Nov 15 to Dec 20
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Coolidge, AZ
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Nov 25 – Dec 9 | Jan 20 – Feb 3 | — | — |
| Peppers | Dec 9 – Dec 23 | Mar 3 – Mar 17 | — | — |
| Eggplant | Dec 9 – Dec 23 | Mar 3 – Mar 17 | — | — |
| Tomatoes | Dec 23 – Jan 6 | Feb 24 – Mar 10 | — | — |
| Lettuce | Dec 23 – Jan 6 | Jan 27 – Feb 10 | Jan 20 – Feb 24 | Oct 4 – Nov 1 |
| Kale | Dec 23 – Jan 6 | Jan 20 – Feb 3 | Jan 20 – Feb 3 | Sep 20 – Oct 11 |
| Broccoli | Dec 23 – Jan 6 | Feb 3 – Feb 17 | — | Aug 23 – Sep 13 |
| Cabbage | Dec 23 – Jan 6 | Jan 27 – Feb 10 | — | Aug 23 – Sep 13 |
| Cauliflower | Dec 23 – Jan 6 | Feb 3 – Feb 17 | — | Aug 23 – Sep 13 |
| Okra | Jan 6 – Jan 20 | Mar 10 – Mar 24 | Mar 10 – Mar 24 | — |
| Basil | Jan 6 – Jan 20 | Feb 24 – Mar 10 | — | — |
| Peas | — | — | Jan 6 – Jan 27 | Sep 6 – Sep 27 |
| Spinach | — | — | Jan 6 – Jan 27 | Oct 4 – Oct 25 |
| Radishes | — | — | Jan 13 – Feb 24 | Oct 18 – Nov 8 |
| Cucumbers | Jan 20 – Jan 27 | Mar 3 – Mar 10 | Feb 24 – Mar 10 | Sep 13 – Sep 27 |
| Zucchini & Summer Squash | Jan 20 – Jan 27 | — | Feb 24 – Mar 10 | Sep 20 – Oct 4 |
| Winter Squash & Pumpkins | Jan 20 – Jan 27 | — | Feb 24 – Mar 10 | — |
| Melons & Watermelon | Jan 20 – Jan 27 | Mar 3 – Mar 17 | — | — |
| Carrots | — | — | Jan 27 – Feb 24 | Sep 6 – Sep 20 |
| Beets | — | — | Jan 27 – Feb 24 | Sep 20 – Oct 4 |
| Potatoes | — | — | Jan 27 – Feb 17 | — |
| Swiss Chard | — | — | Feb 3 – Mar 3 | Sep 20 – Oct 4 |
| Cilantro | — | — | Feb 3 – Feb 24 | Oct 4 – Oct 25 |
| Green Beans | — | — | Feb 24 – Mar 17 | Sep 13 – Sep 27 |
| Sweet Corn | — | — | Feb 24 – Mar 10 | — |
| Sweet Potatoes | — | Mar 3 – Mar 24 | — | — |
| Garlic | — | — | — | Nov 15 – Dec 20 |
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 Casa Grande Nm, AZ weather station, 4 km away (elevation 1,421 ft (433 m)).
Frost dates near Coolidge
- Valley Farms Jan 30 · Dec 12
- Florence Jan 30 · Dec 12
- Casa Grande Feb 5 · Dec 6
- Eloy Feb 24 · Nov 28
- Arizona City Feb 28 · Nov 21
- San Tan Valley Feb 1 · Dec 11
- Sacaton Feb 1 · Dec 11
- Chandler Heights Feb 1 · Dec 11
- Picacho Feb 6 · Dec 9
- Queen Creek Feb 1 · Dec 11
Frequently asked questions
When is the last frost in Coolidge, AZ?
The median last spring frost in Coolidge, AZ is February 17. There is still about a 10% chance of frost after March 8, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Coolidge, AZ?
The median first fall frost is November 29, with about a 10% chance of frost before November 12.
How long is the growing season in Coolidge, AZ?
About 285 days between the median last spring frost and first fall frost.
What planting zone is Coolidge, AZ?
Coolidge, AZ is in USDA hardiness zone 9a.