Utah vegetable planting calendar 2027: frost dates and when to plant
In Utah, the average last spring frost is March 31 in Salt Lake City (NOAA 1991-2020 normals). Below are planting dates for Salt Lake City for 27 common vegetables and herbs, worked out the way the Rowtime app does it: NOAA's average frost dates for the nearest weather station, with the planting rules of state extension guides. Dates are for the 2027 season.
Rowtime: Garden Planner works these dates out for your own ZIP code in Utah, shows where each one comes from, and recalculates when a planting slips. Get Rowtime on the App Store.
Dates are estimates. Check your local extension office before you plant, and use your own frost records if you have them. Dates shift by a week or more within a state, so pick the city closest to your conditions.
Salt Lake City
When to plant tomatoes in Salt Lake City?
In Salt Lake City, Utah, the average last spring frost is March 31 and the average first fall frost is November 8 (NOAA 1991-2020 normals, SALT LAKE TRIAD CTR station, 2 km from ZIP 84111). For tomatoes, start seeds indoors March 5 to May 11 and plant out seedlings April 21 to August 10, following University of Maryland Extension (Home & Garden Information Center) and Utah State University Extension. Dates are for the 2027 season; sources last checked October 24, 2026.
Frost dates for Salt Lake City (84111)
- Last spring frost: Mar 31 on average, Apr 19 for a 10% risk of a later frost.
- First fall frost: Nov 8 on average, Oct 23 for a 10% risk of an earlier frost.
- USDA hardiness zone 7b (PRISM 2023 listing).
| Crop | When |
|---|---|
| Beet | Sow outdoors: Mar 24 to Sep 9 Sow outdoors for fall: Aug 28 to Sep 25 |
| Broccoli | Start seeds indoors: Feb 12 to Mar 21 Plant out seedlings: Mar 8 to Mar 22 Plant out seedlings for fall: Aug 28 to Sep 25 |
| Cabbage | Start seeds indoors: Feb 5 to Mar 4 Plant out seedlings: Mar 8 to Mar 22 Plant out seedlings for fall: Aug 28 to Sep 25 |
| Carrot | Sow outdoors: Mar 24 to Aug 20 |
| Cauliflower | Start seeds indoors: Feb 19 to Mar 21 Plant out seedlings: Mar 24 to Aug 10 Plant out seedlings for fall: Jul 9 to Aug 8 |
| Cucumber | Sow outdoors: Apr 7 to Aug 30 |
| Eggplant | Start seeds indoors: Mar 22 to Apr 20 Plant out seedlings: Apr 21 to Aug 10 |
| Green onion | Plant onion sets: Mar 8 to Mar 22 Plant out seedlings for fall: Aug 28 to Sep 25 |
| Kale | Sow outdoors: Mar 8 to Mar 22 Sow outdoors for fall: Aug 28 to Sep 25 |
| Lettuce | Sow outdoors: Mar 24 to Aug 20 Sow outdoors for fall: Aug 28 to Sep 25 |
| Melon and watermelon | Sow outdoors: Apr 21 to Jul 31 |
| Okra | Plant out seedlings: May 3 to Sep 4 |
| Onion | Plant onion sets: Mar 8 to Mar 22 |
| Pea | Sow outdoors: Mar 8 to Mar 22 |
| Pepper | Start seeds indoors: Mar 5 to Apr 4 Plant out seedlings: Apr 21 to Aug 10 |
| Potato | Plant seed potatoes: Mar 24 to Jul 31 |
| Snap bean | Sow outdoors: Apr 7 to Sep 9 |
| Spinach | Sow outdoors: Mar 8 to Mar 22 Sow outdoors for fall: Aug 28 to Sep 25 |
| Summer squash | Sow outdoors: Apr 7 to Sep 9 |
| Sweet corn | Sow outdoors: Apr 7 to Aug 10 |
| Sweet potato | Sprout slips indoors: Apr 5 to May 4 Plant out slips: May 3 to Jul 1 |
| Tomato | Start seeds indoors: Mar 5 to May 11 Plant out seedlings: Apr 21 to Aug 10 |
| Winter squash and pumpkin | Sow outdoors: Apr 21 to Jul 31 |
| Basil | Plant outdoors: May 4 to Aug 3 |
| Cilantro | Sow outdoors: Feb 4 to Apr 3 Sow outdoors for fall: Sep 16 to Sep 30 |
| Dill | Sow outdoors: Mar 19 to Apr 3 Sow outdoors for fall: Aug 1 to Sep 15 |
| Parsley | Sow outdoors: Mar 24 to Aug 10 Plant outdoors for fall: Aug 1 to Sep 30 |
Sources
Planting rules, in the order Rowtime tries them here:
- Utah State University Extension, Suggested Vegetable Planting Dates for Utah. Checked October 20, 2026.
- Purdue University Extension, Indiana Vegetable Planting Calendar (HO-186-W). Checked October 20, 2026.
- University of Maryland Extension (Home & Garden Information Center), Vegetable Planting Calendar for Central Maryland. Checked October 24, 2026.
- NC State Extension, Central North Carolina Planting Calendar for Annual Vegetables, Fruits, and Herbs (AG-756-01). Checked October 21, 2026.
Frost dates, locations and zones:
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020 annual/seasonal (freeze probabilities).
- U.S. Census Bureau, 2025 Gazetteer Files: ZIP Code Tabulation Areas.
- PRISM Group, Oregon State University / USDA ARS, 2023 USDA Plant Hardiness Zone Map ZIP code listings. PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed 20 Oct 2026.
How the dates are worked out: a guide's rule such as "two weeks after the last frost" is applied to the station's NOAA date. Purdue's dates are 10% dates, so they are counted from the station's 10% date. When a guide gives no last date, the window closes early enough for the crop's longest days to harvest before the first fall frost. When a guide gives no first date for a fall planting, no fall window is shown. "Season too short" means the guide's window would close before it opens at this station's frost dates.
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