Grand Canyon, AZ frost dates
Last spring frostJun 17median date
First fall frostSep 24median date
Growing season99 daysfrost-free
Hardiness zone7aZone 7a
How Grand Canyon compares
- In 8 years out of 10, the last spring frost in Grand Canyon falls between June 3 and July 1, a 28-day window. The first fall frost falls between September 12 and October 6.
- The median last frost is 62 days later than the Arizona median of Apr 16.
- Its 99-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 62 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 226 nights a year at or below 32°F.
- Compared with Flagstaff, AZ, 94 km away, the last frost here is 13 days later than there and the growing season is 17 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | June 3 |
| 50% (median) | June 17 |
| 10% (safe for tender plants) | July 1 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 12 |
| 50% (median) | September 24 |
| 90% (late) | October 6 |
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 Grand Canyon, AZ
Grand Canyon, AZ frost dates — last frost Jun 17, first frost Sep 24, zone 7a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 25 to Apr 8Transplant outside: May 20 to Jun 3
Start indoors: Apr 8 to Apr 22Transplant outside: Jul 1 to Jul 15
Start indoors: Apr 8 to Apr 22Transplant outside: Jul 1 to Jul 15
Start indoors: Apr 22 to May 6Transplant outside: Jun 24 to Jul 8
Start indoors: Apr 22 to May 6Transplant outside: May 27 to Jun 10Sow outdoors: May 20 to Jun 24Plant for fall: Jul 30 to Aug 27
Start indoors: Apr 22 to May 6Transplant outside: May 20 to Jun 3Sow outdoors: May 20 to Jun 3Plant for fall: Jul 16 to Aug 6
Start indoors: Apr 22 to May 6Transplant outside: Jun 3 to Jun 17
Start indoors: Apr 22 to May 6Transplant outside: May 27 to Jun 10
Start indoors: Apr 22 to May 6Transplant outside: Jun 3 to Jun 17
Start indoors: May 6 to May 20Transplant outside: Jul 8 to Jul 22Sow outdoors: Jul 8 to Jul 22
Start indoors: May 6 to May 20Transplant outside: Jun 24 to Jul 8
Sow outdoors: May 6 to May 27Plant for fall: Jul 2 to Jul 23
Sow outdoors: May 6 to May 27Plant for fall: Jul 30 to Aug 20
Sow outdoors: May 13 to Jun 24Plant for fall: Aug 13 to Sep 3
Start indoors: May 20 to May 27Transplant outside: Jul 1 to Jul 8Sow outdoors: Jun 24 to Jul 8
Start indoors: May 20 to May 27Sow outdoors: Jun 24 to Jul 8
Start indoors: May 20 to May 27Sow outdoors: Jun 24 to Jul 8
Start indoors: May 20 to May 27Transplant outside: Jul 1 to Jul 15
Sow outdoors: May 27 to Jun 24
Sow outdoors: May 27 to Jun 24Plant for fall: Jul 16 to Jul 30
Sow outdoors: May 27 to Jun 17
Sow outdoors: Jun 3 to Jul 1Plant for fall: Jul 16 to Jul 30
Sow outdoors: Jun 3 to Jun 24Plant for fall: Jul 30 to Aug 20
Sow outdoors: Jun 24 to Jul 15
Sow outdoors: Jun 24 to Jul 8
Transplant outside: Jul 1 to Jul 22
Plant for fall: Sep 10 to Oct 15
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Grand Canyon, AZ
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 25 – Apr 8 | May 20 – Jun 3 | — | — |
| Peppers | Apr 8 – Apr 22 | Jul 1 – Jul 15 | — | — |
| Eggplant | Apr 8 – Apr 22 | Jul 1 – Jul 15 | — | — |
| Tomatoes | Apr 22 – May 6 | Jun 24 – Jul 8 | — | — |
| Lettuce | Apr 22 – May 6 | May 27 – Jun 10 | May 20 – Jun 24 | Jul 30 – Aug 27 |
| Kale | Apr 22 – May 6 | May 20 – Jun 3 | May 20 – Jun 3 | Jul 16 – Aug 6 |
| Broccoli | Apr 22 – May 6 | Jun 3 – Jun 17 | — | — |
| Cabbage | Apr 22 – May 6 | May 27 – Jun 10 | — | — |
| Cauliflower | Apr 22 – May 6 | Jun 3 – Jun 17 | — | — |
| Okra | May 6 – May 20 | Jul 8 – Jul 22 | Jul 8 – Jul 22 | — |
| Basil | May 6 – May 20 | Jun 24 – Jul 8 | — | — |
| Peas | — | — | May 6 – May 27 | Jul 2 – Jul 23 |
| Spinach | — | — | May 6 – May 27 | Jul 30 – Aug 20 |
| Radishes | — | — | May 13 – Jun 24 | Aug 13 – Sep 3 |
| Cucumbers | May 20 – May 27 | Jul 1 – Jul 8 | Jun 24 – Jul 8 | — |
| Zucchini & Summer Squash | May 20 – May 27 | — | Jun 24 – Jul 8 | — |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 99 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | May 20 – May 27 | — | Jun 24 – Jul 8 | — |
| Melons & Watermelon | May 20 – May 27 | Jul 1 – Jul 15 | — | — |
| Carrots | — | — | May 27 – Jun 24 | — |
| Beets | — | — | May 27 – Jun 24 | Jul 16 – Jul 30 |
| Potatoes | — | — | May 27 – Jun 17 | — |
| Swiss Chard | — | — | Jun 3 – Jul 1 | Jul 16 – Jul 30 |
| Cilantro | — | — | Jun 3 – Jun 24 | Jul 30 – Aug 20 |
| Green Beans | — | — | Jun 24 – Jul 15 | — |
| Sweet Corn | — | — | Jun 24 – Jul 8 | — |
| Sweet Potatoes Warning: Your frost-free season is about 99 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jul 1 – Jul 22 | — | — |
| Garlic | — | — | — | Sep 10 – Oct 15 |
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 Ap, AZ weather station, 2 km away (elevation 6,608 ft (2,014 m)).
Frost dates near Grand Canyon
- North Rim Jun 3 · Sep 27
- Williams May 9 · Oct 19
- Gray Mountain Apr 7 · Nov 3
- Cameron Apr 16 · Oct 28
- Supai Jun 1 · Oct 3
- Parks Jun 21 · Sep 17
- Tuba City Apr 16 · Oct 28
- Bellemont Jun 21 · Sep 17
- Kaibeto Apr 16 · Oct 28
- Ash Fork May 22 · Oct 5
Frequently asked questions
When is the last frost in Grand Canyon, AZ?
The median last spring frost in Grand Canyon, AZ is June 17. There is still about a 10% chance of frost after July 1, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Grand Canyon, AZ?
The median first fall frost is September 24, with about a 10% chance of frost before September 12.
How long is the growing season in Grand Canyon, AZ?
About 99 days between the median last spring frost and first fall frost.
What planting zone is Grand Canyon, AZ?
Grand Canyon, AZ is in USDA hardiness zone 7a.