Lehi, UT planting zone & frost dates
Lehi is in USDA hardiness zone 7a. The last spring frost usually comes around April 30 and the first fall frost around October 9, for a growing season of about 159 days.
Planting calendar for Lehi
Dates are counted from the average last spring frost (April 30) 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 5 – Mar 19 Transplant outdoors: May 7 – May 14 |
| Peppers | Start seeds indoors: Feb 19 – Mar 5 Transplant outdoors: May 14 – May 21 |
| Eggplant | Start seeds indoors: Feb 19 – Mar 5 Transplant outdoors: May 14 – May 21 |
| Broccoli | Start seeds indoors: Feb 19 – Mar 5 Transplant outdoors: Apr 2 – Apr 16 |
| Cabbage | Start seeds indoors: Feb 19 – Mar 5 Transplant outdoors: Apr 2 – Apr 16 |
| Onions (sets) | Plant outdoors: Apr 2 – Apr 16 |
| Peas | Sow outdoors: Mar 19 – Apr 2 |
| Spinach | Sow outdoors: Mar 19 – Apr 2 |
| Lettuce | Sow outdoors: Apr 2 – Apr 16 |
| Carrots | Sow outdoors: Apr 2 – Apr 16 |
| Potatoes | Plant outdoors: Apr 2 – Apr 16 |
| Beans | Sow outdoors: May 7 – May 14 |
| Sweet corn | Sow outdoors: May 7 – May 14 |
| Cucumbers | Sow outdoors: May 7 – May 14 |
| Squash & zucchini | Sow outdoors: May 7 – May 14 |
| Basil | Start seeds indoors: Mar 19 – Apr 2 Transplant outdoors: May 7 – May 14 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 14 (8 weeks before the average first fall frost on Oct 9).
Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Apr 14 | Apr 30 | May 27 |
| First 32°F frost in fall is before | Oct 25 | Oct 9 | Sep 26 |
How to read it: in spring there is a 10% chance of a frost after May 27, so that is a safe date for tender plants. In fall there is a 10% chance of frost before September 26. A hard freeze (28°F) usually ends around April 15.
Hardiness zone by ZIP code in Lehi
- 84043 zone 7a
Nearby cities
- American Fork zone 7a, last frost Apr 17
- Highland zone 7a, last frost May 3
- Saratoga Springs zone 7a, last frost Apr 30
- Cedar Hills zone 7a, last frost May 2
- Alpine zone 7a, last frost May 3
- Pleasant Grove zone 7a, last frost Apr 17
- Bluffdale zone 7a, last frost Apr 18
- Draper zone 7a, last frost Apr 18
Questions
What growing zone is Lehi, UT?
Lehi is in USDA Plant Hardiness Zone 7a (average extreme winter low 0°F to 5°F), according to the USDA 2023 map.
When is the last frost in Lehi?
The average last spring frost (32°F) in Lehi is April 30. There is still a 10% chance of frost until May 27.
When can I plant tomatoes in Lehi?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around May 7 – May 14. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Utah Lake Lehi, UT (USC00428973), 5.3 km (3.3 mi) from the city center, elevation 1373 m, based on 14 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.