Frost dates for 85130 — Casa Grande, AZ
Last spring frostFeb 7median date
First fall frostDec 3median date
Growing season299 daysfrost-free
Hardiness zone9aZone 9a
How Casa Grande compares
- In 8 years out of 10, the last spring frost in Casa Grande falls between January 10 and March 4, a 53-day window. The first fall frost falls between November 17 and December 21.
- The median last frost is 68 days earlier than the Arizona median of Apr 16.
- Its 299-day growing season is among the longest of the 193 Arizona places with a regular frost season.
- The last frost is 24 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 18 nights a year at or below 32°F.
- Nearby San Tan Valley, AZ, 45 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 10 |
| 50% (median) | February 7 |
| 10% (safe for tender plants) | March 4 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 17 |
| 50% (median) | December 3 |
| 90% (late) | December 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 Casa Grande, AZ
Frost dates for 85130 — Casa Grande, AZ — last frost Feb 7, first frost Dec 3, zone 9a. whenisthelastfrost.com
Crop
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Start indoors: Nov 15 to Nov 29Transplant outside: Jan 10 to Jan 24
Start indoors: Nov 29 to Dec 13Transplant outside: Feb 21 to Mar 7
Start indoors: Nov 29 to Dec 13Transplant outside: Feb 21 to Mar 7
Start indoors: Dec 13 to Dec 27Transplant outside: Feb 14 to Feb 28
Start indoors: Dec 13 to Dec 27Transplant outside: Jan 17 to Jan 31Sow outdoors: Jan 10 to Feb 14Plant for fall: Oct 8 to Nov 5
Start indoors: Dec 13 to Dec 27Transplant outside: Jan 10 to Jan 24Sow outdoors: Jan 10 to Jan 24Plant for fall: Sep 24 to Oct 15
Start indoors: Dec 13 to Dec 27Transplant outside: Jan 24 to Feb 7Plant for fall: Aug 27 to Sep 17
Start indoors: Dec 13 to Dec 27Transplant outside: Jan 17 to Jan 31Plant for fall: Aug 27 to Sep 17
Start indoors: Dec 13 to Dec 27Transplant outside: Jan 24 to Feb 7Plant for fall: Aug 27 to Sep 17
Start indoors: Dec 27 to Jan 10Start indoors: Dec 27 to Jan 10Transplant outside: Feb 28 to Mar 14Sow outdoors: Feb 28 to Mar 14
Start indoors: Dec 27 to Jan 10Start indoors: Dec 27 to Jan 10Transplant outside: Feb 14 to Feb 28
Sow outdoors: Dec 27 to Jan 17Sow outdoors: Dec 27 to Jan 17Plant for fall: Sep 10 to Oct 1
Sow outdoors: Dec 27 to Jan 17Sow outdoors: Dec 27 to Jan 17Plant for fall: Oct 8 to Oct 29
Sow outdoors: Jan 3 to Feb 14Plant for fall: Oct 22 to Nov 12
Start indoors: Jan 10 to Jan 17Transplant outside: Feb 21 to Feb 28Sow outdoors: Feb 14 to Feb 28Plant for fall: Sep 17 to Oct 1
Start indoors: Jan 10 to Jan 17Sow outdoors: Feb 14 to Feb 28Plant for fall: Sep 24 to Oct 8
Start indoors: Jan 10 to Jan 17Sow outdoors: Feb 14 to Feb 28
Start indoors: Jan 10 to Jan 17Transplant outside: Feb 21 to Mar 7
Sow outdoors: Jan 17 to Feb 14Plant for fall: Sep 10 to Sep 24
Sow outdoors: Jan 17 to Feb 14Plant for fall: Sep 24 to Oct 8
Sow outdoors: Jan 17 to Feb 7
Sow outdoors: Jan 24 to Feb 21Plant for fall: Sep 24 to Oct 8
Sow outdoors: Jan 24 to Feb 14Plant for fall: Oct 8 to Oct 29
Sow outdoors: Feb 14 to Mar 7Plant for fall: Sep 17 to Oct 1
Sow outdoors: Feb 14 to Feb 28
Transplant outside: Feb 21 to Mar 14
Plant for fall: Nov 19 to Dec 24
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Casa Grande, AZ
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Nov 15 – Nov 29 | Jan 10 – Jan 24 | — | — |
| Peppers | Nov 29 – Dec 13 | Feb 21 – Mar 7 | — | — |
| Eggplant | Nov 29 – Dec 13 | Feb 21 – Mar 7 | — | — |
| Tomatoes | Dec 13 – Dec 27 | Feb 14 – Feb 28 | — | — |
| Lettuce | Dec 13 – Dec 27 | Jan 17 – Jan 31 | Jan 10 – Feb 14 | Oct 8 – Nov 5 |
| Kale | Dec 13 – Dec 27 | Jan 10 – Jan 24 | Jan 10 – Jan 24 | Sep 24 – Oct 15 |
| Broccoli | Dec 13 – Dec 27 | Jan 24 – Feb 7 | — | Aug 27 – Sep 17 |
| Cabbage | Dec 13 – Dec 27 | Jan 17 – Jan 31 | — | Aug 27 – Sep 17 |
| Cauliflower | Dec 13 – Dec 27 | Jan 24 – Feb 7 | — | Aug 27 – Sep 17 |
| Okra | Dec 27 – Jan 10 | Feb 28 – Mar 14 | Feb 28 – Mar 14 | — |
| Basil | Dec 27 – Jan 10 | Feb 14 – Feb 28 | — | — |
| Peas | — | — | Dec 27 – Jan 17 | Sep 10 – Oct 1 |
| Spinach | — | — | Dec 27 – Jan 17 | Oct 8 – Oct 29 |
| Radishes | — | — | Jan 3 – Feb 14 | Oct 22 – Nov 12 |
| Cucumbers | Jan 10 – Jan 17 | Feb 21 – Feb 28 | Feb 14 – Feb 28 | Sep 17 – Oct 1 |
| Zucchini & Summer Squash | Jan 10 – Jan 17 | — | Feb 14 – Feb 28 | Sep 24 – Oct 8 |
| Winter Squash & Pumpkins | Jan 10 – Jan 17 | — | Feb 14 – Feb 28 | — |
| Melons & Watermelon | Jan 10 – Jan 17 | Feb 21 – Mar 7 | — | — |
| Carrots | — | — | Jan 17 – Feb 14 | Sep 10 – Sep 24 |
| Beets | — | — | Jan 17 – Feb 14 | Sep 24 – Oct 8 |
| Potatoes | — | — | Jan 17 – Feb 7 | — |
| Swiss Chard | — | — | Jan 24 – Feb 21 | Sep 24 – Oct 8 |
| Cilantro | — | — | Jan 24 – Feb 14 | Oct 8 – Oct 29 |
| Green Beans | — | — | Feb 14 – Mar 7 | Sep 17 – Oct 1 |
| Sweet Corn | — | — | Feb 14 – Feb 28 | — |
| Sweet Potatoes | — | Feb 21 – Mar 14 | — | — |
| Garlic | — | — | — | Nov 19 – Dec 24 |
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 Robson Rch, AZ weather station, 7 km away (elevation 1,496 ft (456 m)).
ZIP codes in Casa Grande: 85122 85130 85193 85194
Frost dates near Casa Grande
- Arizona City Feb 28 · Nov 21
- Eloy Feb 24 · Nov 28
- Coolidge Feb 17 · Nov 29
- Stanfield Feb 5 · Dec 6
- Picacho Feb 6 · Dec 9
- Valley Farms Jan 30 · Dec 12
- Maricopa Feb 23 · Nov 24
- Sacaton Feb 1 · Dec 11
Frequently asked questions
When is the last frost in Casa Grande, AZ?
The median last spring frost in Casa Grande, AZ is February 7. There is still about a 10% chance of frost after March 4, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Casa Grande, AZ?
The median first fall frost is December 3, with about a 10% chance of frost before November 17.
How long is the growing season in Casa Grande, AZ?
About 299 days between the median last spring frost and first fall frost.
What planting zone is Casa Grande, AZ?
Casa Grande, AZ is in USDA hardiness zone 9a.