Cottonwood Heights, UT planting zone & frost dates
Cottonwood Heights is in USDA hardiness zone 7b. The last spring frost usually comes around April 29 and the first fall frost around October 22, for a growing season of about 174 days.
Planting calendar for Cottonwood Heights
Dates are counted from the average last spring frost (April 29) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Mar 4 – Mar 18 Transplant outdoors: May 6 – May 13 |
| Peppers | Start seeds indoors: Feb 18 – Mar 4 Transplant outdoors: May 13 – May 20 |
| Eggplant | Start seeds indoors: Feb 18 – Mar 4 Transplant outdoors: May 13 – May 20 |
| Broccoli | Start seeds indoors: Feb 18 – Mar 4 Transplant outdoors: Apr 1 – Apr 15 |
| Cabbage | Start seeds indoors: Feb 18 – Mar 4 Transplant outdoors: Apr 1 – Apr 15 |
| Onions (sets) | Plant outdoors: Apr 1 – Apr 15 |
| Peas | Sow outdoors: Mar 18 – Apr 1 |
| Spinach | Sow outdoors: Mar 18 – Apr 1 |
| Lettuce | Sow outdoors: Apr 1 – Apr 15 |
| Carrots | Sow outdoors: Apr 1 – Apr 15 |
| Potatoes | Plant outdoors: Apr 1 – Apr 15 |
| Beans | Sow outdoors: May 6 – May 13 |
| Sweet corn | Sow outdoors: May 6 – May 13 |
| Cucumbers | Sow outdoors: May 6 – May 13 |
| Squash & zucchini | Sow outdoors: May 6 – May 13 |
| Basil | Start seeds indoors: Mar 18 – Apr 1 Transplant outdoors: May 6 – May 13 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 27 (8 weeks before the average first fall frost on Oct 22).
Useful for zone 7b gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Apr 10 | Apr 29 | May 30 |
| First 32°F frost in fall is before | Nov 7 | Oct 22 | Oct 6 |
How to read it: in spring there is a 10% chance of a frost after May 30, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 6. A hard freeze (28°F) usually ends around April 12.
Nearby cities
- Holladay zone 7b, last frost Apr 29
- Sandy zone 7b, last frost Apr 29
- East Millcreek zone 7b, last frost Apr 25
- Canyon Rim zone 7b, last frost Apr 25
- Midvale zone 7b, last frost Apr 29
- Murray zone 7b, last frost Apr 25
- Millcreek zone 7b, last frost Apr 25
- Draper zone 7a, last frost Apr 18
Questions
What growing zone is Cottonwood Heights, UT?
Cottonwood Heights is in USDA Plant Hardiness Zone 7b (average extreme winter low 5°F to 10°F), according to the USDA 2023 map.
When is the last frost in Cottonwood Heights?
The average last spring frost (32°F) in Cottonwood Heights is April 29. There is still a 10% chance of frost until May 30.
When can I plant tomatoes in Cottonwood Heights?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around May 6 – May 13. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Cottonwood Weir, UT (USC00421759), 2.2 km (1.4 mi) from the city center, elevation 1520 m, based on 26 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.