Hereford, AZ frost dates
Last spring frostApr 7median date
First fall frostNov 9median date
Growing season216 daysfrost-free
Hardiness zone8bZone 8b
How Hereford compares
- In 8 years out of 10, the last spring frost in Hereford falls between March 19 and April 27, a 39-day window. The first fall frost falls between October 25 and November 27.
- The median last frost is 9 days earlier than the Arizona median of Apr 16.
- Its 216-day growing season is longer than 57% of the 193 Arizona places with a regular frost season (state median 197 days).
- The last frost is 22 days later than the zone 8b median of Mar 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 8b chart.
- The weather station records an average of 54 nights a year at or below 32°F.
- Nearby Tucson, AZ, 115 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) | March 19 |
| 50% (median) | April 7 |
| 10% (safe for tender plants) | April 27 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 25 |
| 50% (median) | November 9 |
| 90% (late) | November 27 |
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 Hereford, AZ
Hereford, AZ frost dates — last frost Apr 7, first frost Nov 9, zone 8b. whenisthelastfrost.com
Crop
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Start indoors: Jan 13 to Jan 27Transplant outside: Mar 10 to Mar 24
Start indoors: Jan 27 to Feb 10Transplant outside: Apr 21 to May 5
Start indoors: Jan 27 to Feb 10Transplant outside: Apr 21 to May 5
Start indoors: Feb 10 to Feb 24Transplant outside: Apr 14 to Apr 28
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 17 to Mar 31Sow outdoors: Mar 10 to Apr 14Plant for fall: Sep 14 to Oct 12
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 10 to Mar 24Sow outdoors: Mar 10 to Mar 24Plant for fall: Aug 31 to Sep 21
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 24 to Apr 7Plant for fall: Aug 3 to Aug 24
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 17 to Mar 31Plant for fall: Aug 3 to Aug 24
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 24 to Apr 7Plant for fall: Aug 3 to Aug 24
Start indoors: Feb 24 to Mar 10Transplant outside: Apr 28 to May 12Sow outdoors: Apr 28 to May 12
Start indoors: Feb 24 to Mar 10Transplant outside: Apr 14 to Apr 28
Sow outdoors: Feb 24 to Mar 17Plant for fall: Aug 17 to Sep 7
Sow outdoors: Feb 24 to Mar 17Plant for fall: Sep 14 to Oct 5
Sow outdoors: Mar 3 to Apr 14Plant for fall: Sep 28 to Oct 19
Start indoors: Mar 10 to Mar 17Transplant outside: Apr 21 to Apr 28Sow outdoors: Apr 14 to Apr 28Plant for fall: Aug 24 to Sep 7
Start indoors: Mar 10 to Mar 17Sow outdoors: Apr 14 to Apr 28Plant for fall: Aug 31 to Sep 14
Start indoors: Mar 10 to Mar 17Sow outdoors: Apr 14 to Apr 28
Start indoors: Mar 10 to Mar 17Transplant outside: Apr 21 to May 5
Sow outdoors: Mar 17 to Apr 14Plant for fall: Aug 17 to Aug 31
Sow outdoors: Mar 17 to Apr 14Plant for fall: Aug 31 to Sep 14
Sow outdoors: Mar 17 to Apr 7
Sow outdoors: Mar 24 to Apr 21Plant for fall: Aug 31 to Sep 14
Sow outdoors: Mar 24 to Apr 14Plant for fall: Sep 14 to Oct 5
Sow outdoors: Apr 14 to May 5Plant for fall: Aug 24 to Sep 7
Sow outdoors: Apr 14 to Apr 28
Transplant outside: Apr 21 to May 12
Plant for fall: Oct 26 to Nov 30
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Hereford, AZ
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 13 – Jan 27 | Mar 10 – Mar 24 | — | — |
| Peppers | Jan 27 – Feb 10 | Apr 21 – May 5 | — | — |
| Eggplant | Jan 27 – Feb 10 | Apr 21 – May 5 | — | — |
| Tomatoes | Feb 10 – Feb 24 | Apr 14 – Apr 28 | — | — |
| Lettuce | Feb 10 – Feb 24 | Mar 17 – Mar 31 | Mar 10 – Apr 14 | Sep 14 – Oct 12 |
| Kale | Feb 10 – Feb 24 | Mar 10 – Mar 24 | Mar 10 – Mar 24 | Aug 31 – Sep 21 |
| Broccoli | Feb 10 – Feb 24 | Mar 24 – Apr 7 | — | Aug 3 – Aug 24 |
| Cabbage | Feb 10 – Feb 24 | Mar 17 – Mar 31 | — | Aug 3 – Aug 24 |
| Cauliflower | Feb 10 – Feb 24 | Mar 24 – Apr 7 | — | Aug 3 – Aug 24 |
| Okra | Feb 24 – Mar 10 | Apr 28 – May 12 | Apr 28 – May 12 | — |
| Basil | Feb 24 – Mar 10 | Apr 14 – Apr 28 | — | — |
| Peas | — | — | Feb 24 – Mar 17 | Aug 17 – Sep 7 |
| Spinach | — | — | Feb 24 – Mar 17 | Sep 14 – Oct 5 |
| Radishes | — | — | Mar 3 – Apr 14 | Sep 28 – Oct 19 |
| Cucumbers | Mar 10 – Mar 17 | Apr 21 – Apr 28 | Apr 14 – Apr 28 | Aug 24 – Sep 7 |
| Zucchini & Summer Squash | Mar 10 – Mar 17 | — | Apr 14 – Apr 28 | Aug 31 – Sep 14 |
| Winter Squash & Pumpkins | Mar 10 – Mar 17 | — | Apr 14 – Apr 28 | — |
| Melons & Watermelon | Mar 10 – Mar 17 | Apr 21 – May 5 | — | — |
| Carrots | — | — | Mar 17 – Apr 14 | Aug 17 – Aug 31 |
| Beets | — | — | Mar 17 – Apr 14 | Aug 31 – Sep 14 |
| Potatoes | — | — | Mar 17 – Apr 7 | — |
| Swiss Chard | — | — | Mar 24 – Apr 21 | Aug 31 – Sep 14 |
| Cilantro | — | — | Mar 24 – Apr 14 | Sep 14 – Oct 5 |
| Green Beans | — | — | Apr 14 – May 5 | Aug 24 – Sep 7 |
| Sweet Corn | — | — | Apr 14 – Apr 28 | — |
| Sweet Potatoes | — | Apr 21 – May 12 | — | — |
| Garlic | — | — | — | Oct 26 – Nov 30 |
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 Coronado Nmem, AZ weather station, 8 km away (elevation 5,243 ft (1,598 m)).
Frost dates near Hereford
- Sierra Vista Apr 5 · Nov 9
- Fort Huachuca Apr 5 · Nov 9
- Naco Apr 1 · Nov 10
- Bisbee Apr 1 · Nov 10
- Huachuca City Mar 16 · Nov 21
- Mc Neal Apr 1 · Nov 10
- Tombstone Mar 4 · Nov 29
- Elgin Apr 18 · Nov 1
- Patagonia Apr 23 · Oct 30
- Sonoita Mar 28 · Nov 21
Frequently asked questions
When is the last frost in Hereford, AZ?
The median last spring frost in Hereford, AZ is April 7. There is still about a 10% chance of frost after April 27, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Hereford, AZ?
The median first fall frost is November 9, with about a 10% chance of frost before October 25.
How long is the growing season in Hereford, AZ?
About 216 days between the median last spring frost and first fall frost.
What planting zone is Hereford, AZ?
Hereford, AZ is in USDA hardiness zone 8b.