Supai, AZ frost dates
Last spring frostJun 1median date
First fall frostOct 3median date
Growing season124 daysfrost-free
Hardiness zone7aZone 7a
How Supai compares
- In 8 years out of 10, the last spring frost in Supai falls between May 12 and June 17, a 36-day window. The first fall frost falls between September 22 and October 15.
- The median last frost is 46 days later than the Arizona median of Apr 16.
- Its 124-day growing season is longer than 8% of the 193 Arizona places with a regular frost season (state median 197 days).
- The last frost is 46 days later than the zone 7a median of Apr 16. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 7a chart.
- The weather station records an average of 189 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 12 |
| 50% (median) | June 1 |
| 10% (safe for tender plants) | June 17 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 22 |
| 50% (median) | October 3 |
| 90% (late) | October 15 |
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 Supai, AZ
Supai, AZ frost dates — last frost Jun 1, first frost Oct 3, zone 7a. whenisthelastfrost.com
Crop
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Start indoors: Mar 9 to Mar 23Transplant outside: May 4 to May 18
Start indoors: Mar 23 to Apr 6Transplant outside: Jun 15 to Jun 29
Start indoors: Mar 23 to Apr 6Transplant outside: Jun 15 to Jun 29
Start indoors: Apr 6 to Apr 20Transplant outside: Jun 8 to Jun 22
Start indoors: Apr 6 to Apr 20Transplant outside: May 11 to May 25Sow outdoors: May 4 to Jun 8Plant for fall: Aug 8 to Sep 5
Start indoors: Apr 6 to Apr 20Transplant outside: May 4 to May 18Sow outdoors: May 4 to May 18Plant for fall: Jul 25 to Aug 15
Start indoors: Apr 6 to Apr 20Transplant outside: May 18 to Jun 1Plant for fall: Jun 27 to Jul 18
Start indoors: Apr 6 to Apr 20Transplant outside: May 11 to May 25Plant for fall: Jun 27 to Jul 18
Start indoors: Apr 6 to Apr 20Transplant outside: May 18 to Jun 1Plant for fall: Jun 27 to Jul 18
Start indoors: Apr 20 to May 4Transplant outside: Jun 22 to Jul 6Sow outdoors: Jun 22 to Jul 6
Start indoors: Apr 20 to May 4Transplant outside: Jun 8 to Jun 22
Sow outdoors: Apr 20 to May 11Plant for fall: Jul 11 to Aug 1
Sow outdoors: Apr 20 to May 11Plant for fall: Aug 8 to Aug 29
Sow outdoors: Apr 27 to Jun 8Plant for fall: Aug 22 to Sep 12
Start indoors: May 4 to May 11Transplant outside: Jun 15 to Jun 22Sow outdoors: Jun 8 to Jun 22Plant for fall: Jul 18 to Aug 1
Start indoors: May 4 to May 11Sow outdoors: Jun 8 to Jun 22Plant for fall: Jul 25 to Aug 8
Start indoors: May 4 to May 11Sow outdoors: Jun 8 to Jun 22
Start indoors: May 4 to May 11Transplant outside: Jun 15 to Jun 29
Sow outdoors: May 11 to Jun 8Plant for fall: Jul 11 to Jul 25
Sow outdoors: May 11 to Jun 8Plant for fall: Jul 25 to Aug 8
Sow outdoors: May 11 to Jun 1
Sow outdoors: May 18 to Jun 15Plant for fall: Jul 25 to Aug 8
Sow outdoors: May 18 to Jun 8Plant for fall: Aug 8 to Aug 29
Sow outdoors: Jun 8 to Jun 29Plant for fall: Jul 18 to Aug 1
Sow outdoors: Jun 8 to Jun 22
Transplant outside: Jun 15 to Jul 6
Plant for fall: Sep 19 to Oct 24
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Supai, AZ
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 9 – Mar 23 | May 4 – May 18 | — | — |
| Peppers | Mar 23 – Apr 6 | Jun 15 – Jun 29 | — | — |
| Eggplant | Mar 23 – Apr 6 | Jun 15 – Jun 29 | — | — |
| Tomatoes | Apr 6 – Apr 20 | Jun 8 – Jun 22 | — | — |
| Lettuce | Apr 6 – Apr 20 | May 11 – May 25 | May 4 – Jun 8 | Aug 8 – Sep 5 |
| Kale | Apr 6 – Apr 20 | May 4 – May 18 | May 4 – May 18 | Jul 25 – Aug 15 |
| Broccoli | Apr 6 – Apr 20 | May 18 – Jun 1 | — | Jun 27 – Jul 18 |
| Cabbage | Apr 6 – Apr 20 | May 11 – May 25 | — | Jun 27 – Jul 18 |
| Cauliflower | Apr 6 – Apr 20 | May 18 – Jun 1 | — | Jun 27 – Jul 18 |
| Okra | Apr 20 – May 4 | Jun 22 – Jul 6 | Jun 22 – Jul 6 | — |
| Basil | Apr 20 – May 4 | Jun 8 – Jun 22 | — | — |
| Peas | — | — | Apr 20 – May 11 | Jul 11 – Aug 1 |
| Spinach | — | — | Apr 20 – May 11 | Aug 8 – Aug 29 |
| Radishes | — | — | Apr 27 – Jun 8 | Aug 22 – Sep 12 |
| Cucumbers | May 4 – May 11 | Jun 15 – Jun 22 | Jun 8 – Jun 22 | Jul 18 – Aug 1 |
| Zucchini & Summer Squash | May 4 – May 11 | — | Jun 8 – Jun 22 | Jul 25 – Aug 8 |
| Winter Squash & Pumpkins | May 4 – May 11 | — | Jun 8 – Jun 22 | — |
| Melons & Watermelon | May 4 – May 11 | Jun 15 – Jun 29 | — | — |
| Carrots | — | — | May 11 – Jun 8 | Jul 11 – Jul 25 |
| Beets | — | — | May 11 – Jun 8 | Jul 25 – Aug 8 |
| Potatoes | — | — | May 11 – Jun 1 | — |
| Swiss Chard | — | — | May 18 – Jun 15 | Jul 25 – Aug 8 |
| Cilantro | — | — | May 18 – Jun 8 | Aug 8 – Aug 29 |
| Green Beans | — | — | Jun 8 – Jun 29 | Jul 18 – Aug 1 |
| Sweet Corn | — | — | Jun 8 – Jun 22 | — |
| Sweet Potatoes | — | Jun 15 – Jul 6 | — | — |
| Garlic | — | — | — | Sep 19 – Oct 24 |
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 Grand Canyon Np, AZ weather station, 52 km away (elevation 6,785 ft (2,068 m)). That is far enough away that your dates may differ, especially if your elevation is different.
Frost dates near Supai
- North Rim Jun 3 · Sep 27
- Grand Canyon Jun 17 · Sep 24
- Fredonia Apr 29 · Oct 22
- Colorado City Apr 26 · Oct 25
- Williams May 9 · Oct 19
- Marble Canyon Mar 5 · Nov 19
- Peach Springs May 17 · Oct 10
- Seligman May 10 · Oct 15
- Cameron Apr 16 · Oct 28
- Gray Mountain Apr 7 · Nov 3
Frequently asked questions
When is the last frost in Supai, AZ?
The median last spring frost in Supai, AZ is June 1. There is still about a 10% chance of frost after June 17, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Supai, AZ?
The median first fall frost is October 3, with about a 10% chance of frost before September 22.
How long is the growing season in Supai, AZ?
About 124 days between the median last spring frost and first fall frost.
What planting zone is Supai, AZ?
Supai, AZ is in USDA hardiness zone 7a.