Mormon Lake, AZ frost dates
Last spring frostJun 10median date
First fall frostSep 27median date
Growing season109 daysfrost-free
Hardiness zone6bZone 6b
How Mormon Lake compares
- In 8 years out of 10, the last spring frost in Mormon Lake falls between May 26 and June 27, a 32-day window. The first fall frost falls between September 14 and October 8.
- The median last frost is 55 days later than the Arizona median of Apr 16.
- Its 109-day growing season is longer than 3% of the 193 Arizona places with a regular frost season (state median 197 days).
- The last frost is 49 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 213 nights a year at or below 32°F.
- Compared with Flagstaff, AZ, 36 km away, the last frost here is 6 days later than there and the growing season is 7 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 26 |
| 50% (median) | June 10 |
| 10% (safe for tender plants) | June 27 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 14 |
| 50% (median) | September 27 |
| 90% (late) | October 8 |
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 Mormon Lake, AZ
Mormon Lake, AZ frost dates — last frost Jun 10, first frost Sep 27, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Mar 18 to Apr 1Transplant outside: May 13 to May 27
Start indoors: Apr 1 to Apr 15Transplant outside: Jun 24 to Jul 8
Start indoors: Apr 1 to Apr 15Transplant outside: Jun 24 to Jul 8
Start indoors: Apr 15 to Apr 29Transplant outside: Jun 17 to Jul 1
Start indoors: Apr 15 to Apr 29Transplant outside: May 20 to Jun 3Sow outdoors: May 13 to Jun 17Plant for fall: Aug 2 to Aug 30
Start indoors: Apr 15 to Apr 29Transplant outside: May 13 to May 27Sow outdoors: May 13 to May 27Plant for fall: Jul 19 to Aug 9
Start indoors: Apr 15 to Apr 29Transplant outside: May 27 to Jun 10
Start indoors: Apr 15 to Apr 29Transplant outside: May 20 to Jun 3
Start indoors: Apr 15 to Apr 29Transplant outside: May 27 to Jun 10
Start indoors: Apr 29 to May 13Transplant outside: Jul 1 to Jul 15Sow outdoors: Jul 1 to Jul 15
Start indoors: Apr 29 to May 13Transplant outside: Jun 17 to Jul 1
Sow outdoors: Apr 29 to May 20Plant for fall: Jul 5 to Jul 26
Sow outdoors: Apr 29 to May 20Plant for fall: Aug 2 to Aug 23
Sow outdoors: May 6 to Jun 17Plant for fall: Aug 16 to Sep 6
Start indoors: May 13 to May 20Transplant outside: Jun 24 to Jul 1Sow outdoors: Jun 17 to Jul 1
Start indoors: May 13 to May 20Sow outdoors: Jun 17 to Jul 1Plant for fall: Jul 19 to Aug 2
Start indoors: May 13 to May 20Sow outdoors: Jun 17 to Jul 1
Start indoors: May 13 to May 20Transplant outside: Jun 24 to Jul 8
Sow outdoors: May 20 to Jun 17Plant for fall: Jul 5 to Jul 19
Sow outdoors: May 20 to Jun 17Plant for fall: Jul 19 to Aug 2
Sow outdoors: May 20 to Jun 10
Sow outdoors: May 27 to Jun 24Plant for fall: Jul 19 to Aug 2
Sow outdoors: May 27 to Jun 17Plant for fall: Aug 2 to Aug 23
Sow outdoors: Jun 17 to Jul 8
Sow outdoors: Jun 17 to Jul 1
Transplant outside: Jun 24 to Jul 15
Plant for fall: Sep 13 to Oct 18
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Mormon Lake, AZ
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 18 – Apr 1 | May 13 – May 27 | — | — |
| Peppers | Apr 1 – Apr 15 | Jun 24 – Jul 8 | — | — |
| Eggplant | Apr 1 – Apr 15 | Jun 24 – Jul 8 | — | — |
| Tomatoes | Apr 15 – Apr 29 | Jun 17 – Jul 1 | — | — |
| Lettuce | Apr 15 – Apr 29 | May 20 – Jun 3 | May 13 – Jun 17 | Aug 2 – Aug 30 |
| Kale | Apr 15 – Apr 29 | May 13 – May 27 | May 13 – May 27 | Jul 19 – Aug 9 |
| Broccoli | Apr 15 – Apr 29 | May 27 – Jun 10 | — | — |
| Cabbage | Apr 15 – Apr 29 | May 20 – Jun 3 | — | — |
| Cauliflower | Apr 15 – Apr 29 | May 27 – Jun 10 | — | — |
| Okra | Apr 29 – May 13 | Jul 1 – Jul 15 | Jul 1 – Jul 15 | — |
| Basil | Apr 29 – May 13 | Jun 17 – Jul 1 | — | — |
| Peas | — | — | Apr 29 – May 20 | Jul 5 – Jul 26 |
| Spinach | — | — | Apr 29 – May 20 | Aug 2 – Aug 23 |
| Radishes | — | — | May 6 – Jun 17 | Aug 16 – Sep 6 |
| Cucumbers | May 13 – May 20 | Jun 24 – Jul 1 | Jun 17 – Jul 1 | — |
| Zucchini & Summer Squash | May 13 – May 20 | — | Jun 17 – Jul 1 | Jul 19 – Aug 2 |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 109 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 13 – May 20 | — | Jun 17 – Jul 1 | — |
| Melons & Watermelon | May 13 – May 20 | Jun 24 – Jul 8 | — | — |
| Carrots | — | — | May 20 – Jun 17 | Jul 5 – Jul 19 |
| Beets | — | — | May 20 – Jun 17 | Jul 19 – Aug 2 |
| Potatoes | — | — | May 20 – Jun 10 | — |
| Swiss Chard | — | — | May 27 – Jun 24 | Jul 19 – Aug 2 |
| Cilantro | — | — | May 27 – Jun 17 | Aug 2 – Aug 23 |
| Green Beans | — | — | Jun 17 – Jul 8 | — |
| Sweet Corn | — | — | Jun 17 – Jul 1 | — |
| Sweet Potatoes Warning: Your frost-free season is about 109 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 24 – Jul 15 | — | — |
| Garlic | — | — | — | Sep 13 – Oct 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 Mund'S Park, AZ weather station, 16 km away (elevation 6,470 ft (1,972 m)).
Frost dates near Mormon Lake
- Munds Park Jun 10 · Sep 27
- Happy Jack Jun 1 · Oct 3
- Sedona Apr 1 · Nov 17
- Flagstaff Jun 4 · Sep 28
- Lake Montezuma Apr 16 · Oct 30
- Rimrock Apr 16 · Oct 30
- Cornville Mar 30 · Nov 10
- Bellemont Jun 21 · Sep 17
- Camp Verde Apr 16 · Oct 30
- Cottonwood Mar 30 · Nov 10
Frequently asked questions
When is the last frost in Mormon Lake, AZ?
The median last spring frost in Mormon Lake, AZ is June 10. There is still about a 10% chance of frost after June 27, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Mormon Lake, AZ?
The median first fall frost is September 27, with about a 10% chance of frost before September 14.
How long is the growing season in Mormon Lake, AZ?
About 109 days between the median last spring frost and first fall frost.
What planting zone is Mormon Lake, AZ?
Mormon Lake, AZ is in USDA hardiness zone 6b.