Patagonia, AZ frost dates
Last spring frostApr 23median date
First fall frostOct 30median date
Growing season190 daysfrost-free
Hardiness zone8aZone 8a
How Patagonia compares
- In 8 years out of 10, the last spring frost in Patagonia falls between April 8 and May 7, a 29-day window. The first fall frost falls between October 17 and November 13.
- The median last frost is 7 days later than the Arizona median of Apr 16.
- Its 190-day growing season is longer than 44% of the 193 Arizona places with a regular frost season (state median 197 days).
- The last frost is 25 days later than the zone 8a median of Mar 29. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 8a chart.
- The weather station records an average of 102 nights a year at or below 32°F.
- Nearby Tucson, AZ, 80 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) | April 8 |
| 50% (median) | April 23 |
| 10% (safe for tender plants) | May 7 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 17 |
| 50% (median) | October 30 |
| 90% (late) | November 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 Patagonia, AZ
Patagonia, AZ frost dates — last frost Apr 23, first frost Oct 30, zone 8a. whenisthelastfrost.com
Crop
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Start indoors: Jan 29 to Feb 12Transplant outside: Mar 26 to Apr 9
Start indoors: Feb 12 to Feb 26Transplant outside: May 7 to May 21
Start indoors: Feb 12 to Feb 26Transplant outside: May 7 to May 21
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 30 to May 14
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 2 to Apr 16Sow outdoors: Mar 26 to Apr 30Plant for fall: Sep 4 to Oct 2
Start indoors: Feb 26 to Mar 12Transplant outside: Mar 26 to Apr 9Sow outdoors: Mar 26 to Apr 9Plant for fall: Aug 21 to Sep 11
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 9 to Apr 23Plant for fall: Jul 24 to Aug 14
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 2 to Apr 16Plant for fall: Jul 24 to Aug 14
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 9 to Apr 23Plant for fall: Jul 24 to Aug 14
Start indoors: Mar 12 to Mar 26Transplant outside: May 14 to May 28Sow outdoors: May 14 to May 28
Start indoors: Mar 12 to Mar 26Transplant outside: Apr 30 to May 14
Sow outdoors: Mar 12 to Apr 2Plant for fall: Aug 7 to Aug 28
Sow outdoors: Mar 12 to Apr 2Plant for fall: Sep 4 to Sep 25
Sow outdoors: Mar 19 to Apr 30Plant for fall: Sep 18 to Oct 9
Start indoors: Mar 26 to Apr 2Transplant outside: May 7 to May 14Sow outdoors: Apr 30 to May 14Plant for fall: Aug 14 to Aug 28
Start indoors: Mar 26 to Apr 2Sow outdoors: Apr 30 to May 14Plant for fall: Aug 21 to Sep 4
Start indoors: Mar 26 to Apr 2Sow outdoors: Apr 30 to May 14
Start indoors: Mar 26 to Apr 2Transplant outside: May 7 to May 21
Sow outdoors: Apr 2 to Apr 30Plant for fall: Aug 7 to Aug 21
Sow outdoors: Apr 2 to Apr 30Plant for fall: Aug 21 to Sep 4
Sow outdoors: Apr 2 to Apr 23
Sow outdoors: Apr 9 to May 7Plant for fall: Aug 21 to Sep 4
Sow outdoors: Apr 9 to Apr 30Plant for fall: Sep 4 to Sep 25
Sow outdoors: Apr 30 to May 21Plant for fall: Aug 14 to Aug 28
Sow outdoors: Apr 30 to May 14
Transplant outside: May 7 to May 28
Plant for fall: Oct 16 to Nov 20
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Patagonia, AZ
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 29 – Feb 12 | Mar 26 – Apr 9 | — | — |
| Peppers | Feb 12 – Feb 26 | May 7 – May 21 | — | — |
| Eggplant | Feb 12 – Feb 26 | May 7 – May 21 | — | — |
| Tomatoes | Feb 26 – Mar 12 | Apr 30 – May 14 | — | — |
| Lettuce | Feb 26 – Mar 12 | Apr 2 – Apr 16 | Mar 26 – Apr 30 | Sep 4 – Oct 2 |
| Kale | Feb 26 – Mar 12 | Mar 26 – Apr 9 | Mar 26 – Apr 9 | Aug 21 – Sep 11 |
| Broccoli | Feb 26 – Mar 12 | Apr 9 – Apr 23 | — | Jul 24 – Aug 14 |
| Cabbage | Feb 26 – Mar 12 | Apr 2 – Apr 16 | — | Jul 24 – Aug 14 |
| Cauliflower | Feb 26 – Mar 12 | Apr 9 – Apr 23 | — | Jul 24 – Aug 14 |
| Okra | Mar 12 – Mar 26 | May 14 – May 28 | May 14 – May 28 | — |
| Basil | Mar 12 – Mar 26 | Apr 30 – May 14 | — | — |
| Peas | — | — | Mar 12 – Apr 2 | Aug 7 – Aug 28 |
| Spinach | — | — | Mar 12 – Apr 2 | Sep 4 – Sep 25 |
| Radishes | — | — | Mar 19 – Apr 30 | Sep 18 – Oct 9 |
| Cucumbers | Mar 26 – Apr 2 | May 7 – May 14 | Apr 30 – May 14 | Aug 14 – Aug 28 |
| Zucchini & Summer Squash | Mar 26 – Apr 2 | — | Apr 30 – May 14 | Aug 21 – Sep 4 |
| Winter Squash & Pumpkins | Mar 26 – Apr 2 | — | Apr 30 – May 14 | — |
| Melons & Watermelon | Mar 26 – Apr 2 | May 7 – May 21 | — | — |
| Carrots | — | — | Apr 2 – Apr 30 | Aug 7 – Aug 21 |
| Beets | — | — | Apr 2 – Apr 30 | Aug 21 – Sep 4 |
| Potatoes | — | — | Apr 2 – Apr 23 | — |
| Swiss Chard | — | — | Apr 9 – May 7 | Aug 21 – Sep 4 |
| Cilantro | — | — | Apr 9 – Apr 30 | Sep 4 – Sep 25 |
| Green Beans | — | — | Apr 30 – May 21 | Aug 14 – Aug 28 |
| Sweet Corn | — | — | Apr 30 – May 14 | — |
| Sweet Potatoes | — | May 7 – May 28 | — | — |
| Garlic | — | — | — | Oct 16 – Nov 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 Canelo 1 Nw, AZ weather station, 16 km away (elevation 5,010 ft (1,527 m)).
Frost dates near Patagonia
- Sonoita Mar 28 · Nov 21
- Elgin Apr 18 · Nov 1
- Nogales Apr 16 · Nov 2
- Fort Huachuca Apr 5 · Nov 9
- Tumacacori Apr 5 · Nov 10
- Tubac Apr 5 · Nov 10
- Rio Rico Apr 5 · Nov 10
- Huachuca City Mar 16 · Nov 21
- Sierra Vista Apr 5 · Nov 9
- Amado Apr 5 · Nov 10
Frequently asked questions
When is the last frost in Patagonia, AZ?
The median last spring frost in Patagonia, AZ is April 23. There is still about a 10% chance of frost after May 7, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Patagonia, AZ?
The median first fall frost is October 30, with about a 10% chance of frost before October 17.
How long is the growing season in Patagonia, AZ?
About 190 days between the median last spring frost and first fall frost.
What planting zone is Patagonia, AZ?
Patagonia, AZ is in USDA hardiness zone 8a.