Ephraim, UT frost dates
Last spring frostMay 28median date
First fall frostSep 20median date
Growing season115 daysfrost-free
Hardiness zone6aZone 6a
How Ephraim compares
- In 8 years out of 10, the last spring frost in Ephraim falls between May 12 and June 15, a 34-day window. The first fall frost falls between September 5 and October 1.
- The median last frost is 18 days later than the Utah median of May 10.
- Its 115-day growing season is longer than 14% of the 250 Utah places with a regular frost season (state median 148 days).
- The last frost is 29 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 187 nights a year at or below 32°F.
- Compared with Provo, UT, 98 km away, the last frost here is 40 days later than there and the growing season is 71 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 12 |
| 50% (median) | May 28 |
| 10% (safe for tender plants) | June 15 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 5 |
| 50% (median) | September 20 |
| 90% (late) | October 1 |
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 Ephraim, UT
Ephraim, UT frost dates — last frost May 28, first frost Sep 20, zone 6a. whenisthelastfrost.com
Crop
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Start indoors: Mar 5 to Mar 19Transplant outside: Apr 30 to May 14
Start indoors: Mar 19 to Apr 2Transplant outside: Jun 11 to Jun 25
Start indoors: Mar 19 to Apr 2Transplant outside: Jun 11 to Jun 25
Start indoors: Apr 2 to Apr 16Transplant outside: Jun 4 to Jun 18
Start indoors: Apr 2 to Apr 16Transplant outside: May 7 to May 21Sow outdoors: Apr 30 to Jun 4Plant for fall: Jul 26 to Aug 23
Start indoors: Apr 2 to Apr 16Transplant outside: Apr 30 to May 14Sow outdoors: Apr 30 to May 14Plant for fall: Jul 12 to Aug 2
Start indoors: Apr 2 to Apr 16Transplant outside: May 14 to May 28Plant for fall: Jun 14 to Jul 5
Start indoors: Apr 2 to Apr 16Transplant outside: May 7 to May 21Plant for fall: Jun 14 to Jul 5
Start indoors: Apr 2 to Apr 16Transplant outside: May 14 to May 28Plant for fall: Jun 14 to Jul 5
Start indoors: Apr 16 to Apr 30Transplant outside: Jun 18 to Jul 2Sow outdoors: Jun 18 to Jul 2
Start indoors: Apr 16 to Apr 30Transplant outside: Jun 4 to Jun 18
Sow outdoors: Apr 16 to May 7Plant for fall: Jun 28 to Jul 19
Sow outdoors: Apr 16 to May 7Plant for fall: Jul 26 to Aug 16
Sow outdoors: Apr 23 to Jun 4Plant for fall: Aug 9 to Aug 30
Start indoors: Apr 30 to May 7Transplant outside: Jun 11 to Jun 18Sow outdoors: Jun 4 to Jun 18Plant for fall: Jul 5 to Jul 19
Start indoors: Apr 30 to May 7Sow outdoors: Jun 4 to Jun 18Plant for fall: Jul 12 to Jul 26
Start indoors: Apr 30 to May 7Sow outdoors: Jun 4 to Jun 18
Start indoors: Apr 30 to May 7Transplant outside: Jun 11 to Jun 25
Sow outdoors: May 7 to Jun 4Plant for fall: Jun 28 to Jul 12
Sow outdoors: May 7 to Jun 4Plant for fall: Jul 12 to Jul 26
Sow outdoors: May 7 to May 28
Sow outdoors: May 14 to Jun 11Plant for fall: Jul 12 to Jul 26
Sow outdoors: May 14 to Jun 4Plant for fall: Jul 26 to Aug 16
Sow outdoors: Jun 4 to Jun 25
Sow outdoors: Jun 4 to Jun 18
Transplant outside: Jun 11 to Jul 2
Plant for fall: Sep 6 to Oct 11
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Ephraim, UT
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 5 – Mar 19 | Apr 30 – May 14 | — | — |
| Peppers | Mar 19 – Apr 2 | Jun 11 – Jun 25 | — | — |
| Eggplant | Mar 19 – Apr 2 | Jun 11 – Jun 25 | — | — |
| Tomatoes | Apr 2 – Apr 16 | Jun 4 – Jun 18 | — | — |
| Lettuce | Apr 2 – Apr 16 | May 7 – May 21 | Apr 30 – Jun 4 | Jul 26 – Aug 23 |
| Kale | Apr 2 – Apr 16 | Apr 30 – May 14 | Apr 30 – May 14 | Jul 12 – Aug 2 |
| Broccoli | Apr 2 – Apr 16 | May 14 – May 28 | — | Jun 14 – Jul 5 |
| Cabbage | Apr 2 – Apr 16 | May 7 – May 21 | — | Jun 14 – Jul 5 |
| Cauliflower | Apr 2 – Apr 16 | May 14 – May 28 | — | Jun 14 – Jul 5 |
| Okra | Apr 16 – Apr 30 | Jun 18 – Jul 2 | Jun 18 – Jul 2 | — |
| Basil | Apr 16 – Apr 30 | Jun 4 – Jun 18 | — | — |
| Peas | — | — | Apr 16 – May 7 | Jun 28 – Jul 19 |
| Spinach | — | — | Apr 16 – May 7 | Jul 26 – Aug 16 |
| Radishes | — | — | Apr 23 – Jun 4 | Aug 9 – Aug 30 |
| Cucumbers | Apr 30 – May 7 | Jun 11 – Jun 18 | Jun 4 – Jun 18 | Jul 5 – Jul 19 |
| Zucchini & Summer Squash | Apr 30 – May 7 | — | Jun 4 – Jun 18 | Jul 12 – Jul 26 |
| Winter Squash & Pumpkins | Apr 30 – May 7 | — | Jun 4 – Jun 18 | — |
| Melons & Watermelon | Apr 30 – May 7 | Jun 11 – Jun 25 | — | — |
| Carrots | — | — | May 7 – Jun 4 | Jun 28 – Jul 12 |
| Beets | — | — | May 7 – Jun 4 | Jul 12 – Jul 26 |
| Potatoes | — | — | May 7 – May 28 | — |
| Swiss Chard | — | — | May 14 – Jun 11 | Jul 12 – Jul 26 |
| Cilantro | — | — | May 14 – Jun 4 | Jul 26 – Aug 16 |
| Green Beans | — | — | Jun 4 – Jun 25 | — |
| Sweet Corn | — | — | Jun 4 – Jun 18 | — |
| Sweet Potatoes | — | Jun 11 – Jul 2 | — | — |
| Garlic | — | — | — | Sep 6 – Oct 11 |
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 Ephraim, UT weather station, about 1 km away (elevation 5,499 ft (1,676 m)).
Frost dates near Ephraim
- Manti May 11 · Oct 6
- Chester May 26 · Sep 25
- Wales May 26 · Sep 25
- Spring City May 26 · Sep 25
- Moroni May 26 · Sep 25
- Mount Pleasant May 26 · Sep 25
- Sterling May 11 · Oct 6
- Fayette May 31 · Sep 21
- Mayfield May 11 · Oct 6
- Fountain Green May 26 · Sep 25
Frequently asked questions
When is the last frost in Ephraim, UT?
The median last spring frost in Ephraim, UT is May 28. There is still about a 10% chance of frost after June 15, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Ephraim, UT?
The median first fall frost is September 20, with about a 10% chance of frost before September 5.
How long is the growing season in Ephraim, UT?
About 115 days between the median last spring frost and first fall frost.
What planting zone is Ephraim, UT?
Ephraim, UT is in USDA hardiness zone 6a.