Vernon, AZ frost dates
Last spring frostMay 20median date
First fall frostOct 11median date
Growing season144 daysfrost-free
Hardiness zone6bZone 6b
How Vernon compares
- In 8 years out of 10, the last spring frost in Vernon falls between May 5 and June 4, a 30-day window. The first fall frost falls between September 29 and October 24.
- The median last frost is 34 days later than the Arizona median of Apr 16.
- Its 144-day growing season is longer than 19% of the 193 Arizona places with a regular frost season (state median 197 days).
- The last frost is 28 days later than the zone 6b median of Apr 22. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6b chart.
- The weather station records an average of 170 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 5 |
| 50% (median) | May 20 |
| 10% (safe for tender plants) | June 4 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 29 |
| 50% (median) | October 11 |
| 90% (late) | October 24 |
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 Vernon, AZ
Vernon, AZ frost dates — last frost May 20, first frost Oct 11, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Feb 25 to Mar 11Transplant outside: Apr 22 to May 6
Start indoors: Mar 11 to Mar 25Transplant outside: Jun 3 to Jun 17
Start indoors: Mar 11 to Mar 25Transplant outside: Jun 3 to Jun 17
Start indoors: Mar 25 to Apr 8Transplant outside: May 27 to Jun 10
Start indoors: Mar 25 to Apr 8Transplant outside: Apr 29 to May 13Sow outdoors: Apr 22 to May 27Plant for fall: Aug 16 to Sep 13
Start indoors: Mar 25 to Apr 8Transplant outside: Apr 22 to May 6Sow outdoors: Apr 22 to May 6Plant for fall: Aug 2 to Aug 23
Start indoors: Mar 25 to Apr 8Transplant outside: May 6 to May 20Plant for fall: Jul 5 to Jul 26
Start indoors: Mar 25 to Apr 8Transplant outside: Apr 29 to May 13Plant for fall: Jul 5 to Jul 26
Start indoors: Mar 25 to Apr 8Transplant outside: May 6 to May 20Plant for fall: Jul 5 to Jul 26
Start indoors: Apr 8 to Apr 22Transplant outside: Jun 10 to Jun 24Sow outdoors: Jun 10 to Jun 24
Start indoors: Apr 8 to Apr 22Transplant outside: May 27 to Jun 10
Sow outdoors: Apr 8 to Apr 29Plant for fall: Jul 19 to Aug 9
Sow outdoors: Apr 8 to Apr 29Plant for fall: Aug 16 to Sep 6
Sow outdoors: Apr 15 to May 27Plant for fall: Aug 30 to Sep 20
Start indoors: Apr 22 to Apr 29Transplant outside: Jun 3 to Jun 10Sow outdoors: May 27 to Jun 10Plant for fall: Jul 26 to Aug 9
Start indoors: Apr 22 to Apr 29Sow outdoors: May 27 to Jun 10Plant for fall: Aug 2 to Aug 16
Start indoors: Apr 22 to Apr 29Sow outdoors: May 27 to Jun 10
Start indoors: Apr 22 to Apr 29Transplant outside: Jun 3 to Jun 17
Sow outdoors: Apr 29 to May 27Plant for fall: Jul 19 to Aug 2
Sow outdoors: Apr 29 to May 27Plant for fall: Aug 2 to Aug 16
Sow outdoors: Apr 29 to May 20
Sow outdoors: May 6 to Jun 3Plant for fall: Aug 2 to Aug 16
Sow outdoors: May 6 to May 27Plant for fall: Aug 16 to Sep 6
Sow outdoors: May 27 to Jun 17Plant for fall: Jul 26 to Aug 9
Sow outdoors: May 27 to Jun 10
Transplant outside: Jun 3 to Jun 24
Plant for fall: Sep 27 to Nov 1
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Vernon, AZ
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 25 – Mar 11 | Apr 22 – May 6 | — | — |
| Peppers | Mar 11 – Mar 25 | Jun 3 – Jun 17 | — | — |
| Eggplant | Mar 11 – Mar 25 | Jun 3 – Jun 17 | — | — |
| Tomatoes | Mar 25 – Apr 8 | May 27 – Jun 10 | — | — |
| Lettuce | Mar 25 – Apr 8 | Apr 29 – May 13 | Apr 22 – May 27 | Aug 16 – Sep 13 |
| Kale | Mar 25 – Apr 8 | Apr 22 – May 6 | Apr 22 – May 6 | Aug 2 – Aug 23 |
| Broccoli | Mar 25 – Apr 8 | May 6 – May 20 | — | Jul 5 – Jul 26 |
| Cabbage | Mar 25 – Apr 8 | Apr 29 – May 13 | — | Jul 5 – Jul 26 |
| Cauliflower | Mar 25 – Apr 8 | May 6 – May 20 | — | Jul 5 – Jul 26 |
| Okra | Apr 8 – Apr 22 | Jun 10 – Jun 24 | Jun 10 – Jun 24 | — |
| Basil | Apr 8 – Apr 22 | May 27 – Jun 10 | — | — |
| Peas | — | — | Apr 8 – Apr 29 | Jul 19 – Aug 9 |
| Spinach | — | — | Apr 8 – Apr 29 | Aug 16 – Sep 6 |
| Radishes | — | — | Apr 15 – May 27 | Aug 30 – Sep 20 |
| Cucumbers | Apr 22 – Apr 29 | Jun 3 – Jun 10 | May 27 – Jun 10 | Jul 26 – Aug 9 |
| Zucchini & Summer Squash | Apr 22 – Apr 29 | — | May 27 – Jun 10 | Aug 2 – Aug 16 |
| Winter Squash & Pumpkins | Apr 22 – Apr 29 | — | May 27 – Jun 10 | — |
| Melons & Watermelon | Apr 22 – Apr 29 | Jun 3 – Jun 17 | — | — |
| Carrots | — | — | Apr 29 – May 27 | Jul 19 – Aug 2 |
| Beets | — | — | Apr 29 – May 27 | Aug 2 – Aug 16 |
| Potatoes | — | — | Apr 29 – May 20 | — |
| Swiss Chard | — | — | May 6 – Jun 3 | Aug 2 – Aug 16 |
| Cilantro | — | — | May 6 – May 27 | Aug 16 – Sep 6 |
| Green Beans | — | — | May 27 – Jun 17 | Jul 26 – Aug 9 |
| Sweet Corn | — | — | May 27 – Jun 10 | — |
| Sweet Potatoes | — | Jun 3 – Jun 24 | — | — |
| Garlic | — | — | — | Sep 27 – Nov 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 Mc Nary 2n, AZ weather station, 22 km away (elevation 7,339 ft (2,237 m)).
Frost dates near Vernon
- Concho May 2 · Oct 14
- Mcnary May 20 · Oct 11
- Pinetop May 22 · Oct 6
- Lakeside May 22 · Oct 6
- Show Low May 5 · Oct 15
- Springerville Jun 1 · Sep 26
- Greer Jun 5 · Sep 29
- Saint Johns May 3 · Oct 10
- Eagar Jun 1 · Sep 26
- Taylor May 11 · Oct 10
Frequently asked questions
When is the last frost in Vernon, AZ?
The median last spring frost in Vernon, AZ is May 20. There is still about a 10% chance of frost after June 4, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Vernon, AZ?
The median first fall frost is October 11, with about a 10% chance of frost before September 29.
How long is the growing season in Vernon, AZ?
About 144 days between the median last spring frost and first fall frost.
What planting zone is Vernon, AZ?
Vernon, AZ is in USDA hardiness zone 6b.