Rimrock, AZ frost dates
Last spring frostApr 16median date
First fall frostOct 30median date
Growing season197 daysfrost-free
Hardiness zone8aZone 8a
How Rimrock compares
- In 8 years out of 10, the last spring frost in Rimrock falls between March 28 and May 2, a 35-day window. The first fall frost falls between October 15 and November 13.
- The median last frost is the same as the Arizona median of Apr 16.
- Its 197-day growing season is longer than 48% of the 193 Arizona places with a regular frost season (state median 197 days).
- The last frost is 18 days later than the zone 8a median of Mar 29. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 8a chart.
- The weather station records an average of 99 nights a year at or below 32°F.
- Compared with Flagstaff, AZ, 63 km away, the last frost here is 49 days earlier than there and the growing season is 81 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 28 |
| 50% (median) | April 16 |
| 10% (safe for tender plants) | May 2 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 15 |
| 50% (median) | October 30 |
| 90% (late) | November 13 |
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 Rimrock, AZ
Rimrock, AZ frost dates — last frost Apr 16, first frost Oct 30, zone 8a. whenisthelastfrost.com
Crop
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Start indoors: Jan 22 to Feb 5Transplant outside: Mar 19 to Apr 2
Start indoors: Feb 5 to Feb 19Transplant outside: Apr 30 to May 14
Start indoors: Feb 5 to Feb 19Transplant outside: Apr 30 to May 14
Start indoors: Feb 19 to Mar 5Transplant outside: Apr 23 to May 7
Start indoors: Feb 19 to Mar 5Transplant outside: Mar 26 to Apr 9Sow outdoors: Mar 19 to Apr 23Plant for fall: Sep 4 to Oct 2
Start indoors: Feb 19 to Mar 5Transplant outside: Mar 19 to Apr 2Sow outdoors: Mar 19 to Apr 2Plant for fall: Aug 21 to Sep 11
Start indoors: Feb 19 to Mar 5Transplant outside: Apr 2 to Apr 16Plant for fall: Jul 24 to Aug 14
Start indoors: Feb 19 to Mar 5Transplant outside: Mar 26 to Apr 9Plant for fall: Jul 24 to Aug 14
Start indoors: Feb 19 to Mar 5Transplant outside: Apr 2 to Apr 16Plant for fall: Jul 24 to Aug 14
Start indoors: Mar 5 to Mar 19Transplant outside: May 7 to May 21Sow outdoors: May 7 to May 21
Start indoors: Mar 5 to Mar 19Transplant outside: Apr 23 to May 7
Sow outdoors: Mar 5 to Mar 26Plant for fall: Aug 7 to Aug 28
Sow outdoors: Mar 5 to Mar 26Plant for fall: Sep 4 to Sep 25
Sow outdoors: Mar 12 to Apr 23Plant for fall: Sep 18 to Oct 9
Start indoors: Mar 19 to Mar 26Transplant outside: Apr 30 to May 7Sow outdoors: Apr 23 to May 7Plant for fall: Aug 14 to Aug 28
Start indoors: Mar 19 to Mar 26Sow outdoors: Apr 23 to May 7Plant for fall: Aug 21 to Sep 4
Start indoors: Mar 19 to Mar 26Sow outdoors: Apr 23 to May 7
Start indoors: Mar 19 to Mar 26Transplant outside: Apr 30 to May 14
Sow outdoors: Mar 26 to Apr 23Plant for fall: Aug 7 to Aug 21
Sow outdoors: Mar 26 to Apr 23Plant for fall: Aug 21 to Sep 4
Sow outdoors: Mar 26 to Apr 16
Sow outdoors: Apr 2 to Apr 30Plant for fall: Aug 21 to Sep 4
Sow outdoors: Apr 2 to Apr 23Plant for fall: Sep 4 to Sep 25
Sow outdoors: Apr 23 to May 14Plant for fall: Aug 14 to Aug 28
Sow outdoors: Apr 23 to May 7
Transplant outside: Apr 30 to May 21
Plant for fall: Oct 16 to Nov 20
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Rimrock, AZ
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 22 – Feb 5 | Mar 19 – Apr 2 | — | — |
| Peppers | Feb 5 – Feb 19 | Apr 30 – May 14 | — | — |
| Eggplant | Feb 5 – Feb 19 | Apr 30 – May 14 | — | — |
| Tomatoes | Feb 19 – Mar 5 | Apr 23 – May 7 | — | — |
| Lettuce | Feb 19 – Mar 5 | Mar 26 – Apr 9 | Mar 19 – Apr 23 | Sep 4 – Oct 2 |
| Kale | Feb 19 – Mar 5 | Mar 19 – Apr 2 | Mar 19 – Apr 2 | Aug 21 – Sep 11 |
| Broccoli | Feb 19 – Mar 5 | Apr 2 – Apr 16 | — | Jul 24 – Aug 14 |
| Cabbage | Feb 19 – Mar 5 | Mar 26 – Apr 9 | — | Jul 24 – Aug 14 |
| Cauliflower | Feb 19 – Mar 5 | Apr 2 – Apr 16 | — | Jul 24 – Aug 14 |
| Okra | Mar 5 – Mar 19 | May 7 – May 21 | May 7 – May 21 | — |
| Basil | Mar 5 – Mar 19 | Apr 23 – May 7 | — | — |
| Peas | — | — | Mar 5 – Mar 26 | Aug 7 – Aug 28 |
| Spinach | — | — | Mar 5 – Mar 26 | Sep 4 – Sep 25 |
| Radishes | — | — | Mar 12 – Apr 23 | Sep 18 – Oct 9 |
| Cucumbers | Mar 19 – Mar 26 | Apr 30 – May 7 | Apr 23 – May 7 | Aug 14 – Aug 28 |
| Zucchini & Summer Squash | Mar 19 – Mar 26 | — | Apr 23 – May 7 | Aug 21 – Sep 4 |
| Winter Squash & Pumpkins | Mar 19 – Mar 26 | — | Apr 23 – May 7 | — |
| Melons & Watermelon | Mar 19 – Mar 26 | Apr 30 – May 14 | — | — |
| Carrots | — | — | Mar 26 – Apr 23 | Aug 7 – Aug 21 |
| Beets | — | — | Mar 26 – Apr 23 | Aug 21 – Sep 4 |
| Potatoes | — | — | Mar 26 – Apr 16 | — |
| Swiss Chard | — | — | Apr 2 – Apr 30 | Aug 21 – Sep 4 |
| Cilantro | — | — | Apr 2 – Apr 23 | Sep 4 – Sep 25 |
| Green Beans | — | — | Apr 23 – May 14 | Aug 14 – Aug 28 |
| Sweet Corn | — | — | Apr 23 – May 7 | — |
| Sweet Potatoes | — | Apr 30 – May 21 | — | — |
| Garlic | — | — | — | Oct 16 – Nov 20 |
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 Montezuma Castle Nm, AZ weather station, 6 km away (elevation 3,179 ft (969 m)).
Frost dates near Rimrock
- Lake Montezuma Apr 16 · Oct 30
- Camp Verde Apr 16 · Oct 30
- Cornville Mar 30 · Nov 10
- Sedona Apr 1 · Nov 17
- Cottonwood Mar 30 · Nov 10
- Clarkdale Mar 30 · Nov 10
- Jerome Mar 26 · Nov 25
- Munds Park Jun 10 · Sep 27
- Pine Apr 9 · Nov 10
- Happy Jack Jun 1 · Oct 3
Frequently asked questions
When is the last frost in Rimrock, AZ?
The median last spring frost in Rimrock, AZ is April 16. There is still about a 10% chance of frost after May 2, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Rimrock, AZ?
The median first fall frost is October 30, with about a 10% chance of frost before October 15.
How long is the growing season in Rimrock, AZ?
About 197 days between the median last spring frost and first fall frost.
What planting zone is Rimrock, AZ?
Rimrock, AZ is in USDA hardiness zone 8a.