Monticello, UT frost dates
Last spring frostMay 19median date
First fall frostOct 2median date
Growing season136 daysfrost-free
Hardiness zone6bZone 6b
How Monticello compares
- In 8 years out of 10, the last spring frost in Monticello falls between May 3 and June 6, a 34-day window. The first fall frost falls between September 20 and October 15.
- The median last frost is 9 days later than the Utah median of May 10.
- Its 136-day growing season is longer than 39% of the 250 Utah places with a regular frost season (state median 148 days).
- The last frost is 27 days later than the zone 6b median of Apr 22. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 6b chart.
- The weather station records an average of 180 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 3 |
| 50% (median) | May 19 |
| 10% (safe for tender plants) | June 6 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 20 |
| 50% (median) | October 2 |
| 90% (late) | October 15 |
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 Monticello, UT
Monticello, UT frost dates — last frost May 19, first frost Oct 2, zone 6b. whenisthelastfrost.com
Crop
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Start indoors: Feb 24 to Mar 10Transplant outside: Apr 21 to May 5
Start indoors: Mar 10 to Mar 24Transplant outside: Jun 2 to Jun 16
Start indoors: Mar 10 to Mar 24Transplant outside: Jun 2 to Jun 16
Start indoors: Mar 24 to Apr 7Transplant outside: May 26 to Jun 9
Start indoors: Mar 24 to Apr 7Transplant outside: Apr 28 to May 12Sow outdoors: Apr 21 to May 26Plant for fall: Aug 7 to Sep 4
Start indoors: Mar 24 to Apr 7Transplant outside: Apr 21 to May 5Sow outdoors: Apr 21 to May 5Plant for fall: Jul 24 to Aug 14
Start indoors: Mar 24 to Apr 7Transplant outside: May 5 to May 19Plant for fall: Jun 26 to Jul 17
Start indoors: Mar 24 to Apr 7Transplant outside: Apr 28 to May 12Plant for fall: Jun 26 to Jul 17
Start indoors: Mar 24 to Apr 7Transplant outside: May 5 to May 19Plant for fall: Jun 26 to Jul 17
Start indoors: Apr 7 to Apr 21Transplant outside: Jun 9 to Jun 23Sow outdoors: Jun 9 to Jun 23
Start indoors: Apr 7 to Apr 21Transplant outside: May 26 to Jun 9
Sow outdoors: Apr 7 to Apr 28Plant for fall: Jul 10 to Jul 31
Sow outdoors: Apr 7 to Apr 28Plant for fall: Aug 7 to Aug 28
Sow outdoors: Apr 14 to May 26Plant for fall: Aug 21 to Sep 11
Start indoors: Apr 21 to Apr 28Transplant outside: Jun 2 to Jun 9Sow outdoors: May 26 to Jun 9Plant for fall: Jul 17 to Jul 31
Start indoors: Apr 21 to Apr 28Sow outdoors: May 26 to Jun 9Plant for fall: Jul 24 to Aug 7
Start indoors: Apr 21 to Apr 28Sow outdoors: May 26 to Jun 9
Start indoors: Apr 21 to Apr 28Transplant outside: Jun 2 to Jun 16
Sow outdoors: Apr 28 to May 26Plant for fall: Jul 10 to Jul 24
Sow outdoors: Apr 28 to May 26Plant for fall: Jul 24 to Aug 7
Sow outdoors: Apr 28 to May 19
Sow outdoors: May 5 to Jun 2Plant for fall: Jul 24 to Aug 7
Sow outdoors: May 5 to May 26Plant for fall: Aug 7 to Aug 28
Sow outdoors: May 26 to Jun 16Plant for fall: Jul 17 to Jul 31
Sow outdoors: May 26 to Jun 9
Transplant outside: Jun 2 to Jun 23
Plant for fall: Sep 18 to Oct 23
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Monticello, UT
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 24 – Mar 10 | Apr 21 – May 5 | — | — |
| Peppers | Mar 10 – Mar 24 | Jun 2 – Jun 16 | — | — |
| Eggplant | Mar 10 – Mar 24 | Jun 2 – Jun 16 | — | — |
| Tomatoes | Mar 24 – Apr 7 | May 26 – Jun 9 | — | — |
| Lettuce | Mar 24 – Apr 7 | Apr 28 – May 12 | Apr 21 – May 26 | Aug 7 – Sep 4 |
| Kale | Mar 24 – Apr 7 | Apr 21 – May 5 | Apr 21 – May 5 | Jul 24 – Aug 14 |
| Broccoli | Mar 24 – Apr 7 | May 5 – May 19 | — | Jun 26 – Jul 17 |
| Cabbage | Mar 24 – Apr 7 | Apr 28 – May 12 | — | Jun 26 – Jul 17 |
| Cauliflower | Mar 24 – Apr 7 | May 5 – May 19 | — | Jun 26 – Jul 17 |
| Okra | Apr 7 – Apr 21 | Jun 9 – Jun 23 | Jun 9 – Jun 23 | — |
| Basil | Apr 7 – Apr 21 | May 26 – Jun 9 | — | — |
| Peas | — | — | Apr 7 – Apr 28 | Jul 10 – Jul 31 |
| Spinach | — | — | Apr 7 – Apr 28 | Aug 7 – Aug 28 |
| Radishes | — | — | Apr 14 – May 26 | Aug 21 – Sep 11 |
| Cucumbers | Apr 21 – Apr 28 | Jun 2 – Jun 9 | May 26 – Jun 9 | Jul 17 – Jul 31 |
| Zucchini & Summer Squash | Apr 21 – Apr 28 | — | May 26 – Jun 9 | Jul 24 – Aug 7 |
| Winter Squash & Pumpkins | Apr 21 – Apr 28 | — | May 26 – Jun 9 | — |
| Melons & Watermelon | Apr 21 – Apr 28 | Jun 2 – Jun 16 | — | — |
| Carrots | — | — | Apr 28 – May 26 | Jul 10 – Jul 24 |
| Beets | — | — | Apr 28 – May 26 | Jul 24 – Aug 7 |
| Potatoes | — | — | Apr 28 – May 19 | — |
| Swiss Chard | — | — | May 5 – Jun 2 | Jul 24 – Aug 7 |
| Cilantro | — | — | May 5 – May 26 | Aug 7 – Aug 28 |
| Green Beans | — | — | May 26 – Jun 16 | Jul 17 – Jul 31 |
| Sweet Corn | — | — | May 26 – Jun 9 | — |
| Sweet Potatoes | — | Jun 2 – Jun 23 | — | — |
| 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 Monticello 2e, UT weather station, 5 km away (elevation 6,821 ft (2,079 m)).
Frost dates near Monticello
- Blanding Apr 28 · Oct 21
- La Sal May 17 · Oct 6
- Bluff Apr 24 · Oct 13
- Moab Apr 11 · Oct 23
- Montezuma Creek May 2 · Oct 10
- Aneth May 2 · Oct 10
- Lake Powell Mar 9 · Nov 20
- Mexican Hat Apr 11 · Oct 30
- Cisco Apr 27 · Oct 9
- Thompson Apr 22 · Oct 20
Frequently asked questions
When is the last frost in Monticello, UT?
The median last spring frost in Monticello, UT is May 19. There is still about a 10% chance of frost after June 6, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Monticello, UT?
The median first fall frost is October 2, with about a 10% chance of frost before September 20.
How long is the growing season in Monticello, UT?
About 136 days between the median last spring frost and first fall frost.
What planting zone is Monticello, UT?
Monticello, UT is in USDA hardiness zone 6b.