Frost dates for 85622 — Green Valley, AZ
Last spring frostFeb 25median date
First fall frostNov 27median date
Growing season275 daysfrost-free
Hardiness zone9aZone 9a
How Green Valley compares
- In 8 years out of 10, the last spring frost in Green Valley falls between January 31 and March 18, a 46-day window. The first fall frost falls between November 12 and December 13.
- The median last frost is 50 days earlier than the Arizona median of Apr 16.
- Its 275-day growing season is longer than 93% of the 193 Arizona places with a regular frost season (state median 197 days).
- The last frost is 6 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 24 nights a year at or below 32°F.
- Nearby Tucson, AZ, 46 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 31 |
| 50% (median) | February 25 |
| 10% (safe for tender plants) | March 18 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 12 |
| 50% (median) | November 27 |
| 90% (late) | December 13 |
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 Green Valley, AZ
Frost dates for 85622 — Green Valley, AZ — last frost Feb 25, first frost Nov 27, zone 9a. whenisthelastfrost.com
Crop
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Start indoors: Dec 3 to Dec 17Transplant outside: Jan 28 to Feb 11
Start indoors: Dec 17 to Dec 31Transplant outside: Mar 11 to Mar 25
Start indoors: Dec 17 to Dec 31Transplant outside: Mar 11 to Mar 25
Start indoors: Dec 31 to Jan 14Start indoors: Dec 31 to Jan 14Transplant outside: Mar 4 to Mar 18
Start indoors: Dec 31 to Jan 14Start indoors: Dec 31 to Jan 14Transplant outside: Feb 4 to Feb 18Sow outdoors: Jan 28 to Mar 4Plant for fall: Oct 2 to Oct 30
Start indoors: Dec 31 to Jan 14Start indoors: Dec 31 to Jan 14Transplant outside: Jan 28 to Feb 11Sow outdoors: Jan 28 to Feb 11Plant for fall: Sep 18 to Oct 9
Start indoors: Dec 31 to Jan 14Start indoors: Dec 31 to Jan 14Transplant outside: Feb 11 to Feb 25Plant for fall: Aug 21 to Sep 11
Start indoors: Dec 31 to Jan 14Start indoors: Dec 31 to Jan 14Transplant outside: Feb 4 to Feb 18Plant for fall: Aug 21 to Sep 11
Start indoors: Dec 31 to Jan 14Start indoors: Dec 31 to Jan 14Transplant outside: Feb 11 to Feb 25Plant for fall: Aug 21 to Sep 11
Start indoors: Jan 14 to Jan 28Transplant outside: Mar 18 to Apr 1Sow outdoors: Mar 18 to Apr 1
Start indoors: Jan 14 to Jan 28Transplant outside: Mar 4 to Mar 18
Sow outdoors: Jan 14 to Feb 4Plant for fall: Sep 4 to Sep 25
Sow outdoors: Jan 14 to Feb 4Plant for fall: Oct 2 to Oct 23
Sow outdoors: Jan 21 to Mar 4Plant for fall: Oct 16 to Nov 6
Start indoors: Jan 28 to Feb 4Transplant outside: Mar 11 to Mar 18Sow outdoors: Mar 4 to Mar 18Plant for fall: Sep 11 to Sep 25
Start indoors: Jan 28 to Feb 4Sow outdoors: Mar 4 to Mar 18Plant for fall: Sep 18 to Oct 2
Start indoors: Jan 28 to Feb 4Sow outdoors: Mar 4 to Mar 18
Start indoors: Jan 28 to Feb 4Transplant outside: Mar 11 to Mar 25
Sow outdoors: Feb 4 to Mar 4Plant for fall: Sep 4 to Sep 18
Sow outdoors: Feb 4 to Mar 4Plant for fall: Sep 18 to Oct 2
Sow outdoors: Feb 4 to Feb 25
Sow outdoors: Feb 11 to Mar 11Plant for fall: Sep 18 to Oct 2
Sow outdoors: Feb 11 to Mar 4Plant for fall: Oct 2 to Oct 23
Sow outdoors: Mar 4 to Mar 25Plant for fall: Sep 11 to Sep 25
Sow outdoors: Mar 4 to Mar 18
Transplant outside: Mar 11 to Apr 1
Plant for fall: Nov 13 to Dec 18
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Green Valley, AZ
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 3 – Dec 17 | Jan 28 – Feb 11 | — | — |
| Peppers | Dec 17 – Dec 31 | Mar 11 – Mar 25 | — | — |
| Eggplant | Dec 17 – Dec 31 | Mar 11 – Mar 25 | — | — |
| Tomatoes | Dec 31 – Jan 14 | Mar 4 – Mar 18 | — | — |
| Lettuce | Dec 31 – Jan 14 | Feb 4 – Feb 18 | Jan 28 – Mar 4 | Oct 2 – Oct 30 |
| Kale | Dec 31 – Jan 14 | Jan 28 – Feb 11 | Jan 28 – Feb 11 | Sep 18 – Oct 9 |
| Broccoli | Dec 31 – Jan 14 | Feb 11 – Feb 25 | — | Aug 21 – Sep 11 |
| Cabbage | Dec 31 – Jan 14 | Feb 4 – Feb 18 | — | Aug 21 – Sep 11 |
| Cauliflower | Dec 31 – Jan 14 | Feb 11 – Feb 25 | — | Aug 21 – Sep 11 |
| Okra | Jan 14 – Jan 28 | Mar 18 – Apr 1 | Mar 18 – Apr 1 | — |
| Basil | Jan 14 – Jan 28 | Mar 4 – Mar 18 | — | — |
| Peas | — | — | Jan 14 – Feb 4 | Sep 4 – Sep 25 |
| Spinach | — | — | Jan 14 – Feb 4 | Oct 2 – Oct 23 |
| Radishes | — | — | Jan 21 – Mar 4 | Oct 16 – Nov 6 |
| Cucumbers | Jan 28 – Feb 4 | Mar 11 – Mar 18 | Mar 4 – Mar 18 | Sep 11 – Sep 25 |
| Zucchini & Summer Squash | Jan 28 – Feb 4 | — | Mar 4 – Mar 18 | Sep 18 – Oct 2 |
| Winter Squash & Pumpkins | Jan 28 – Feb 4 | — | Mar 4 – Mar 18 | — |
| Melons & Watermelon | Jan 28 – Feb 4 | Mar 11 – Mar 25 | — | — |
| Carrots | — | — | Feb 4 – Mar 4 | Sep 4 – Sep 18 |
| Beets | — | — | Feb 4 – Mar 4 | Sep 18 – Oct 2 |
| Potatoes | — | — | Feb 4 – Feb 25 | — |
| Swiss Chard | — | — | Feb 11 – Mar 11 | Sep 18 – Oct 2 |
| Cilantro | — | — | Feb 11 – Mar 4 | Oct 2 – Oct 23 |
| Green Beans | — | — | Mar 4 – Mar 25 | Sep 11 – Sep 25 |
| Sweet Corn | — | — | Mar 4 – Mar 18 | — |
| Sweet Potatoes | — | Mar 11 – Apr 1 | — | — |
| Garlic | — | — | — | Nov 13 – Dec 18 |
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 Green Valley, AZ weather station, 10 km away (elevation 2,900 ft (884 m)).
ZIP codes in Green Valley: 85614 85622
Frost dates near Green Valley
- Sahuarita Feb 25 · Nov 27
- Amado Apr 5 · Nov 10
- Tubac Apr 5 · Nov 10
- Tumacacori Apr 5 · Nov 10
- Arivaca Mar 21 · Nov 20
- Rio Rico Apr 5 · Nov 10
- Vail Jan 26 · Dec 16
- Nogales Apr 16 · Nov 2
Frequently asked questions
When is the last frost in Green Valley, AZ?
The median last spring frost in Green Valley, AZ is February 25. There is still about a 10% chance of frost after March 18, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Green Valley, AZ?
The median first fall frost is November 27, with about a 10% chance of frost before November 12.
How long is the growing season in Green Valley, AZ?
About 275 days between the median last spring frost and first fall frost.
What planting zone is Green Valley, AZ?
Green Valley, AZ is in USDA hardiness zone 9a.