Kirkland, AZ frost dates
Last spring frostApr 7median date
First fall frostNov 12median date
Growing season219 daysfrost-free
Hardiness zone8bZone 8b
How Kirkland compares
- In 8 years out of 10, the last spring frost in Kirkland falls between March 14 and May 3, a 50-day window. The first fall frost falls between October 26 and November 25.
- The median last frost is 9 days earlier than the Arizona median of Apr 16.
- Its 219-day growing season is longer than 59% 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 60 nights a year at or below 32°F.
- Nearby Surprise, AZ, 102 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 14 |
| 50% (median) | April 7 |
| 10% (safe for tender plants) | May 3 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 26 |
| 50% (median) | November 12 |
| 90% (late) | November 25 |
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 Kirkland, AZ
Kirkland, AZ frost dates — last frost Apr 7, first frost Nov 12, 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 17 to Oct 15
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 10 to Mar 24Sow outdoors: Mar 10 to Mar 24Plant for fall: Sep 3 to Sep 24
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 24 to Apr 7Plant for fall: Aug 6 to Aug 27
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 17 to Mar 31Plant for fall: Aug 6 to Aug 27
Start indoors: Feb 10 to Feb 24Transplant outside: Mar 24 to Apr 7Plant for fall: Aug 6 to Aug 27
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 20 to Sep 10
Sow outdoors: Feb 24 to Mar 17Plant for fall: Sep 17 to Oct 8
Sow outdoors: Mar 3 to Apr 14Plant for fall: Oct 1 to Oct 22
Start indoors: Mar 10 to Mar 17Transplant outside: Apr 21 to Apr 28Sow outdoors: Apr 14 to Apr 28Plant for fall: Aug 27 to Sep 10
Start indoors: Mar 10 to Mar 17Sow outdoors: Apr 14 to Apr 28Plant for fall: Sep 3 to Sep 17
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 20 to Sep 3
Sow outdoors: Mar 17 to Apr 14Plant for fall: Sep 3 to Sep 17
Sow outdoors: Mar 17 to Apr 7
Sow outdoors: Mar 24 to Apr 21Plant for fall: Sep 3 to Sep 17
Sow outdoors: Mar 24 to Apr 14Plant for fall: Sep 17 to Oct 8
Sow outdoors: Apr 14 to May 5Plant for fall: Aug 27 to Sep 10
Sow outdoors: Apr 14 to Apr 28
Transplant outside: Apr 21 to May 12
Plant for fall: Oct 29 to Dec 3
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Kirkland, 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 17 – Oct 15 |
| Kale | Feb 10 – Feb 24 | Mar 10 – Mar 24 | Mar 10 – Mar 24 | Sep 3 – Sep 24 |
| Broccoli | Feb 10 – Feb 24 | Mar 24 – Apr 7 | — | Aug 6 – Aug 27 |
| Cabbage | Feb 10 – Feb 24 | Mar 17 – Mar 31 | — | Aug 6 – Aug 27 |
| Cauliflower | Feb 10 – Feb 24 | Mar 24 – Apr 7 | — | Aug 6 – Aug 27 |
| 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 20 – Sep 10 |
| Spinach | — | — | Feb 24 – Mar 17 | Sep 17 – Oct 8 |
| Radishes | — | — | Mar 3 – Apr 14 | Oct 1 – Oct 22 |
| Cucumbers | Mar 10 – Mar 17 | Apr 21 – Apr 28 | Apr 14 – Apr 28 | Aug 27 – Sep 10 |
| Zucchini & Summer Squash | Mar 10 – Mar 17 | — | Apr 14 – Apr 28 | Sep 3 – Sep 17 |
| 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 20 – Sep 3 |
| Beets | — | — | Mar 17 – Apr 14 | Sep 3 – Sep 17 |
| Potatoes | — | — | Mar 17 – Apr 7 | — |
| Swiss Chard | — | — | Mar 24 – Apr 21 | Sep 3 – Sep 17 |
| Cilantro | — | — | Mar 24 – Apr 14 | Sep 17 – Oct 8 |
| Green Beans | — | — | Apr 14 – May 5 | Aug 27 – Sep 10 |
| Sweet Corn | — | — | Apr 14 – Apr 28 | — |
| Sweet Potatoes | — | Apr 21 – May 12 | — | — |
| Garlic | — | — | — | Oct 29 – Dec 3 |
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 Bagdad, AZ weather station, 30 km away (elevation 3,934 ft (1,199 m)).
Frost dates near Kirkland
- Skull Valley Apr 30 · Oct 20
- Yarnell Mar 7 · Nov 20
- Bagdad Apr 7 · Nov 12
- Congress Mar 7 · Nov 20
- Prescott (Yavapai) May 24 · Oct 7
- Prescott Apr 30 · Oct 20
- Chino Valley Apr 27 · Oct 24
- Sedona (Yavapai) Apr 20 · Oct 27
- Crown King Apr 5 · Nov 17
- Wickenburg Mar 7 · Nov 20
Frequently asked questions
When is the last frost in Kirkland, AZ?
The median last spring frost in Kirkland, AZ is April 7. There is still about a 10% chance of frost after May 3, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Kirkland, AZ?
The median first fall frost is November 12, with about a 10% chance of frost before October 26.
How long is the growing season in Kirkland, AZ?
About 219 days between the median last spring frost and first fall frost.
What planting zone is Kirkland, AZ?
Kirkland, AZ is in USDA hardiness zone 8b.