Rockville, UT frost dates
Last spring frostApr 13median date
First fall frostNov 2median date
Growing season203 daysfrost-free
Hardiness zone8aZone 8a
How Rockville compares
- In 8 years out of 10, the last spring frost in Rockville falls between March 22 and May 2, a 41-day window. The first fall frost falls between October 20 and November 17.
- The median last frost is 27 days earlier than the Utah median of May 10.
- Its 203-day growing season is longer than 92% of the 250 Utah places with a regular frost season (state median 148 days).
- The last frost is 15 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 71 nights a year at or below 32°F.
- Compared with Saint George, UT, 48 km away, the last frost here is 30 days later than there and the growing season is 38 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 22 |
| 50% (median) | April 13 |
| 10% (safe for tender plants) | May 2 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 20 |
| 50% (median) | November 2 |
| 90% (late) | November 17 |
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 Rockville, UT
Rockville, UT frost dates — last frost Apr 13, first frost Nov 2, zone 8a. whenisthelastfrost.com
Crop
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Start indoors: Jan 19 to Feb 2Transplant outside: Mar 16 to Mar 30
Start indoors: Feb 2 to Feb 16Transplant outside: Apr 27 to May 11
Start indoors: Feb 2 to Feb 16Transplant outside: Apr 27 to May 11
Start indoors: Feb 16 to Mar 2Transplant outside: Apr 20 to May 4
Start indoors: Feb 16 to Mar 2Transplant outside: Mar 23 to Apr 6Sow outdoors: Mar 16 to Apr 20Plant for fall: Sep 7 to Oct 5
Start indoors: Feb 16 to Mar 2Transplant outside: Mar 16 to Mar 30Sow outdoors: Mar 16 to Mar 30Plant for fall: Aug 24 to Sep 14
Start indoors: Feb 16 to Mar 2Transplant outside: Mar 30 to Apr 13Plant for fall: Jul 27 to Aug 17
Start indoors: Feb 16 to Mar 2Transplant outside: Mar 23 to Apr 6Plant for fall: Jul 27 to Aug 17
Start indoors: Feb 16 to Mar 2Transplant outside: Mar 30 to Apr 13Plant for fall: Jul 27 to Aug 17
Start indoors: Mar 2 to Mar 16Transplant outside: May 4 to May 18Sow outdoors: May 4 to May 18
Start indoors: Mar 2 to Mar 16Transplant outside: Apr 20 to May 4
Sow outdoors: Mar 2 to Mar 23Plant for fall: Aug 10 to Aug 31
Sow outdoors: Mar 2 to Mar 23Plant for fall: Sep 7 to Sep 28
Sow outdoors: Mar 9 to Apr 20Plant for fall: Sep 21 to Oct 12
Start indoors: Mar 16 to Mar 23Transplant outside: Apr 27 to May 4Sow outdoors: Apr 20 to May 4Plant for fall: Aug 17 to Aug 31
Start indoors: Mar 16 to Mar 23Sow outdoors: Apr 20 to May 4Plant for fall: Aug 24 to Sep 7
Start indoors: Mar 16 to Mar 23Sow outdoors: Apr 20 to May 4
Start indoors: Mar 16 to Mar 23Transplant outside: Apr 27 to May 11
Sow outdoors: Mar 23 to Apr 20Plant for fall: Aug 10 to Aug 24
Sow outdoors: Mar 23 to Apr 20Plant for fall: Aug 24 to Sep 7
Sow outdoors: Mar 23 to Apr 13
Sow outdoors: Mar 30 to Apr 27Plant for fall: Aug 24 to Sep 7
Sow outdoors: Mar 30 to Apr 20Plant for fall: Sep 7 to Sep 28
Sow outdoors: Apr 20 to May 11Plant for fall: Aug 17 to Aug 31
Sow outdoors: Apr 20 to May 4
Transplant outside: Apr 27 to May 18
Plant for fall: Oct 19 to Nov 23
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Rockville, UT
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 19 – Feb 2 | Mar 16 – Mar 30 | — | — |
| Peppers | Feb 2 – Feb 16 | Apr 27 – May 11 | — | — |
| Eggplant | Feb 2 – Feb 16 | Apr 27 – May 11 | — | — |
| Tomatoes | Feb 16 – Mar 2 | Apr 20 – May 4 | — | — |
| Lettuce | Feb 16 – Mar 2 | Mar 23 – Apr 6 | Mar 16 – Apr 20 | Sep 7 – Oct 5 |
| Kale | Feb 16 – Mar 2 | Mar 16 – Mar 30 | Mar 16 – Mar 30 | Aug 24 – Sep 14 |
| Broccoli | Feb 16 – Mar 2 | Mar 30 – Apr 13 | — | Jul 27 – Aug 17 |
| Cabbage | Feb 16 – Mar 2 | Mar 23 – Apr 6 | — | Jul 27 – Aug 17 |
| Cauliflower | Feb 16 – Mar 2 | Mar 30 – Apr 13 | — | Jul 27 – Aug 17 |
| Okra | Mar 2 – Mar 16 | May 4 – May 18 | May 4 – May 18 | — |
| Basil | Mar 2 – Mar 16 | Apr 20 – May 4 | — | — |
| Peas | — | — | Mar 2 – Mar 23 | Aug 10 – Aug 31 |
| Spinach | — | — | Mar 2 – Mar 23 | Sep 7 – Sep 28 |
| Radishes | — | — | Mar 9 – Apr 20 | Sep 21 – Oct 12 |
| Cucumbers | Mar 16 – Mar 23 | Apr 27 – May 4 | Apr 20 – May 4 | Aug 17 – Aug 31 |
| Zucchini & Summer Squash | Mar 16 – Mar 23 | — | Apr 20 – May 4 | Aug 24 – Sep 7 |
| Winter Squash & Pumpkins | Mar 16 – Mar 23 | — | Apr 20 – May 4 | — |
| Melons & Watermelon | Mar 16 – Mar 23 | Apr 27 – May 11 | — | — |
| Carrots | — | — | Mar 23 – Apr 20 | Aug 10 – Aug 24 |
| Beets | — | — | Mar 23 – Apr 20 | Aug 24 – Sep 7 |
| Potatoes | — | — | Mar 23 – Apr 13 | — |
| Swiss Chard | — | — | Mar 30 – Apr 27 | Aug 24 – Sep 7 |
| Cilantro | — | — | Mar 30 – Apr 20 | Sep 7 – Sep 28 |
| Green Beans | — | — | Apr 20 – May 11 | Aug 17 – Aug 31 |
| Sweet Corn | — | — | Apr 20 – May 4 | — |
| Sweet Potatoes | — | Apr 27 – May 18 | — | — |
| Garlic | — | — | — | Oct 19 – Nov 23 |
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 Zion Np, UT weather station, 8 km away (elevation 4,039 ft (1,231 m)).
Frost dates near Rockville
- Springdale Apr 13 · Nov 2
- Virgin Apr 1 · Nov 5
- Hildale Apr 26 · Oct 25
- La Verkin Apr 1 · Nov 5
- Toquerville Apr 1 · Nov 5
- Hurricane Apr 1 · Nov 5
- Leeds Apr 1 · Nov 5
- Mount Carmel May 15 · Oct 8
- Orderville May 15 · Oct 8
- New Harmony May 9 · Oct 11
Frequently asked questions
When is the last frost in Rockville, UT?
The median last spring frost in Rockville, UT is April 13. 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 Rockville, UT?
The median first fall frost is November 2, with about a 10% chance of frost before October 20.
How long is the growing season in Rockville, UT?
About 203 days between the median last spring frost and first fall frost.
What planting zone is Rockville, UT?
Rockville, UT is in USDA hardiness zone 8a.