Park Valley, UT frost dates
Last spring frostMay 21median date
First fall frostOct 2median date
Growing season134 daysfrost-free
Hardiness zone6aZone 6a
How Park Valley compares
- In 8 years out of 10, the last spring frost in Park Valley falls between May 2 and June 11, a 40-day window. The first fall frost falls between September 17 and October 17.
- The median last frost is 11 days later than the Utah median of May 10.
- Its 134-day growing season is longer than 38% of the 250 Utah places with a regular frost season (state median 148 days).
- The last frost is 22 days later than the zone 6a median of Apr 29. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6a chart.
- The weather station records an average of 175 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 2 |
| 50% (median) | May 21 |
| 10% (safe for tender plants) | June 11 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 17 |
| 50% (median) | October 2 |
| 90% (late) | October 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 Park Valley, UT
Park Valley, UT frost dates — last frost May 21, first frost Oct 2, zone 6a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Feb 26 to Mar 12Transplant outside: Apr 23 to May 7
Start indoors: Mar 12 to Mar 26Transplant outside: Jun 4 to Jun 18
Start indoors: Mar 12 to Mar 26Transplant outside: Jun 4 to Jun 18
Start indoors: Mar 26 to Apr 9Transplant outside: May 28 to Jun 11
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 30 to May 14Sow outdoors: Apr 23 to May 28Plant for fall: Aug 7 to Sep 4
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 23 to May 7Sow outdoors: Apr 23 to May 7Plant for fall: Jul 24 to Aug 14
Start indoors: Mar 26 to Apr 9Transplant outside: May 7 to May 21Plant for fall: Jun 26 to Jul 17
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 30 to May 14Plant for fall: Jun 26 to Jul 17
Start indoors: Mar 26 to Apr 9Transplant outside: May 7 to May 21Plant for fall: Jun 26 to Jul 17
Start indoors: Apr 9 to Apr 23Transplant outside: Jun 11 to Jun 25Sow outdoors: Jun 11 to Jun 25
Start indoors: Apr 9 to Apr 23Transplant outside: May 28 to Jun 11
Sow outdoors: Apr 9 to Apr 30Plant for fall: Jul 10 to Jul 31
Sow outdoors: Apr 9 to Apr 30Plant for fall: Aug 7 to Aug 28
Sow outdoors: Apr 16 to May 28Plant for fall: Aug 21 to Sep 11
Start indoors: Apr 23 to Apr 30Transplant outside: Jun 4 to Jun 11Sow outdoors: May 28 to Jun 11Plant for fall: Jul 17 to Jul 31
Start indoors: Apr 23 to Apr 30Sow outdoors: May 28 to Jun 11Plant for fall: Jul 24 to Aug 7
Start indoors: Apr 23 to Apr 30Sow outdoors: May 28 to Jun 11
Start indoors: Apr 23 to Apr 30Transplant outside: Jun 4 to Jun 18
Sow outdoors: Apr 30 to May 28Plant for fall: Jul 10 to Jul 24
Sow outdoors: Apr 30 to May 28Plant for fall: Jul 24 to Aug 7
Sow outdoors: Apr 30 to May 21
Sow outdoors: May 7 to Jun 4Plant for fall: Jul 24 to Aug 7
Sow outdoors: May 7 to May 28Plant for fall: Aug 7 to Aug 28
Sow outdoors: May 28 to Jun 18Plant for fall: Jul 17 to Jul 31
Sow outdoors: May 28 to Jun 11
Transplant outside: Jun 4 to Jun 25
Plant for fall: Sep 18 to Oct 23
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Park Valley, UT
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 26 – Mar 12 | Apr 23 – May 7 | — | — |
| Peppers | Mar 12 – Mar 26 | Jun 4 – Jun 18 | — | — |
| Eggplant | Mar 12 – Mar 26 | Jun 4 – Jun 18 | — | — |
| Tomatoes | Mar 26 – Apr 9 | May 28 – Jun 11 | — | — |
| Lettuce | Mar 26 – Apr 9 | Apr 30 – May 14 | Apr 23 – May 28 | Aug 7 – Sep 4 |
| Kale | Mar 26 – Apr 9 | Apr 23 – May 7 | Apr 23 – May 7 | Jul 24 – Aug 14 |
| Broccoli | Mar 26 – Apr 9 | May 7 – May 21 | — | Jun 26 – Jul 17 |
| Cabbage | Mar 26 – Apr 9 | Apr 30 – May 14 | — | Jun 26 – Jul 17 |
| Cauliflower | Mar 26 – Apr 9 | May 7 – May 21 | — | Jun 26 – Jul 17 |
| Okra | Apr 9 – Apr 23 | Jun 11 – Jun 25 | Jun 11 – Jun 25 | — |
| Basil | Apr 9 – Apr 23 | May 28 – Jun 11 | — | — |
| Peas | — | — | Apr 9 – Apr 30 | Jul 10 – Jul 31 |
| Spinach | — | — | Apr 9 – Apr 30 | Aug 7 – Aug 28 |
| Radishes | — | — | Apr 16 – May 28 | Aug 21 – Sep 11 |
| Cucumbers | Apr 23 – Apr 30 | Jun 4 – Jun 11 | May 28 – Jun 11 | Jul 17 – Jul 31 |
| Zucchini & Summer Squash | Apr 23 – Apr 30 | — | May 28 – Jun 11 | Jul 24 – Aug 7 |
| Winter Squash & Pumpkins | Apr 23 – Apr 30 | — | May 28 – Jun 11 | — |
| Melons & Watermelon | Apr 23 – Apr 30 | Jun 4 – Jun 18 | — | — |
| Carrots | — | — | Apr 30 – May 28 | Jul 10 – Jul 24 |
| Beets | — | — | Apr 30 – May 28 | Jul 24 – Aug 7 |
| Potatoes | — | — | Apr 30 – May 21 | — |
| Swiss Chard | — | — | May 7 – Jun 4 | Jul 24 – Aug 7 |
| Cilantro | — | — | May 7 – May 28 | Aug 7 – Aug 28 |
| Green Beans | — | — | May 28 – Jun 18 | Jul 17 – Jul 31 |
| Sweet Corn | — | — | May 28 – Jun 11 | — |
| Sweet Potatoes | — | Jun 4 – Jun 25 | — | — |
| Garlic | — | — | — | Sep 18 – Oct 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 Rosette, UT weather station, 7 km away (elevation 5,686 ft (1,733 m)).
Frost dates near Park Valley
- Grouse Creek Jun 4 · Sep 17
- Snowville May 17 · Sep 24
- Howell May 17 · Sep 24
- Portage May 22 · Sep 20
- Tremonton Apr 24 · Oct 17
- Riverside Apr 24 · Oct 17
- Garland Apr 24 · Oct 17
- Plymouth May 3 · Oct 12
- Fielding May 3 · Oct 12
- Corinne May 5 · Oct 5
Frequently asked questions
When is the last frost in Park Valley, UT?
The median last spring frost in Park Valley, UT is May 21. There is still about a 10% chance of frost after June 11, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Park Valley, UT?
The median first fall frost is October 2, with about a 10% chance of frost before September 17.
How long is the growing season in Park Valley, UT?
About 134 days between the median last spring frost and first fall frost.
What planting zone is Park Valley, UT?
Park Valley, UT is in USDA hardiness zone 6a.