Frost dates for 85143 — San Tan Valley, AZ
Frost is light and occasional here — typically a few cold nights around midwinter (about 11 a year). Cover tender plants when frost is forecast.
How San Tan Valley compares
- In a typical year, frost nights in San Tan Valley fall between December 11 and February 1. In 1 year in 10 the first frost comes as early as November 23, or the last frost as late as February 27.
- San Tan Valley shares its weather station with Gilbert, AZ, 25 km away, so the two have the same frost dates.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | January 2 |
| 50% (median) | February 1 |
| 10% (safe for tender plants) | February 27 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 23 |
| 50% (median) | December 11 |
| 90% (late) | January 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 San Tan Valley, AZ
Frost dates for 85143 — San Tan Valley, AZ — last frost Feb 1, first frost Dec 11, zone 9b. whenisthelastfrost.com
In mild climates, summer heat limits many crops as much as frost does. Use this calendar for spring planting and lean on fall and winter for cool-season crops.
When to plant vegetables in San Tan Valley, AZ
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Nov 9 – Nov 23 | Jan 4 – Jan 18 | — | — |
| Peppers | Nov 23 – Dec 7 | Feb 15 – Mar 1 | — | — |
| Eggplant | Nov 23 – Dec 7 | Feb 15 – Mar 1 | — | — |
| Tomatoes | Dec 7 – Dec 21 | Feb 8 – Feb 22 | — | — |
| Lettuce | Dec 7 – Dec 21 | Jan 11 – Jan 25 | Jan 4 – Feb 8 | Oct 16 – Nov 13 |
| Kale | Dec 7 – Dec 21 | Jan 4 – Jan 18 | Jan 4 – Jan 18 | Oct 2 – Oct 23 |
| Broccoli | Dec 7 – Dec 21 | Jan 18 – Feb 1 | — | Sep 4 – Sep 25 |
| Cabbage | Dec 7 – Dec 21 | Jan 11 – Jan 25 | — | Sep 4 – Sep 25 |
| Cauliflower | Dec 7 – Dec 21 | Jan 18 – Feb 1 | — | Sep 4 – Sep 25 |
| Okra | Dec 21 – Jan 4 | Feb 22 – Mar 8 | Feb 22 – Mar 8 | — |
| Basil | Dec 21 – Jan 4 | Feb 8 – Feb 22 | — | — |
| Peas | — | — | Dec 21 – Jan 11 | Sep 18 – Oct 9 |
| Spinach | — | — | Dec 21 – Jan 11 | Oct 16 – Nov 6 |
| Radishes | — | — | Dec 28 – Feb 8 | Oct 30 – Nov 20 |
| Cucumbers | Jan 4 – Jan 11 | Feb 15 – Feb 22 | Feb 8 – Feb 22 | Sep 25 – Oct 9 |
| Zucchini & Summer Squash | Jan 4 – Jan 11 | — | Feb 8 – Feb 22 | Oct 2 – Oct 16 |
| Winter Squash & Pumpkins | Jan 4 – Jan 11 | — | Feb 8 – Feb 22 | — |
| Melons & Watermelon | Jan 4 – Jan 11 | Feb 15 – Mar 1 | — | — |
| Carrots | — | — | Jan 11 – Feb 8 | Sep 18 – Oct 2 |
| Beets | — | — | Jan 11 – Feb 8 | Oct 2 – Oct 16 |
| Potatoes | — | — | Jan 11 – Feb 1 | — |
| Swiss Chard | — | — | Jan 18 – Feb 15 | Oct 2 – Oct 16 |
| Cilantro | — | — | Jan 18 – Feb 8 | Oct 16 – Nov 6 |
| Green Beans | — | — | Feb 8 – Mar 1 | Sep 25 – Oct 9 |
| Sweet Corn | — | — | Feb 8 – Feb 22 | — |
| Sweet Potatoes | — | Feb 15 – Mar 8 | — | — |
| Garlic | — | — | — | Nov 27 – Jan 1 |
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 Chandler Heights, AZ weather station, 14 km away (elevation 1,424 ft (434 m)).
ZIP codes in San Tan Valley: 85140 85143 85144
Frost dates near San Tan Valley
- Queen Creek Feb 1 · Dec 11
- Chandler Heights Feb 1 · Dec 11
- Higley Feb 1 · Dec 11
- Sacaton Feb 1 · Dec 11
- Apache Junction Feb 11 · Dec 10
- Gold Canyon Feb 11 · Dec 10
- Valley Farms Jan 30 · Dec 12
- Gilbert Feb 1 · Dec 11
Frequently asked questions
When is the last frost in San Tan Valley, AZ?
The median last spring frost in San Tan Valley, AZ is February 1. There is still about a 10% chance of frost after February 27, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in San Tan Valley, AZ?
The median first fall frost is December 11, with about a 10% chance of frost before November 23.
How long is the growing season in San Tan Valley, AZ?
About 313 days between the median last spring frost and first fall frost.
What planting zone is San Tan Valley, AZ?
San Tan Valley, AZ is in USDA hardiness zone 9b.