Alpine, UT planting zone & frost dates
Alpine is in USDA hardiness zone 7a. The last spring frost usually comes around May 3 and the first fall frost around October 12, for a growing season of about 159 days.
Planting calendar for Alpine
Dates are counted from the average last spring frost (May 3) 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 8 – Mar 22 Transplant outdoors: May 10 – May 17 |
| Peppers | Start seeds indoors: Feb 22 – Mar 8 Transplant outdoors: May 17 – May 24 |
| Eggplant | Start seeds indoors: Feb 22 – Mar 8 Transplant outdoors: May 17 – May 24 |
| Broccoli | Start seeds indoors: Feb 22 – Mar 8 Transplant outdoors: Apr 5 – Apr 19 |
| Cabbage | Start seeds indoors: Feb 22 – Mar 8 Transplant outdoors: Apr 5 – Apr 19 |
| Onions (sets) | Plant outdoors: Apr 5 – Apr 19 |
| Peas | Sow outdoors: Mar 22 – Apr 5 |
| Spinach | Sow outdoors: Mar 22 – Apr 5 |
| Lettuce | Sow outdoors: Apr 5 – Apr 19 |
| Carrots | Sow outdoors: Apr 5 – Apr 19 |
| Potatoes | Plant outdoors: Apr 5 – Apr 19 |
| Beans | Sow outdoors: May 10 – May 17 |
| Sweet corn | Sow outdoors: May 10 – May 17 |
| Cucumbers | Sow outdoors: May 10 – May 17 |
| Squash & zucchini | Sow outdoors: May 10 – May 17 |
| Basil | Start seeds indoors: Mar 22 – Apr 5 Transplant outdoors: May 10 – May 17 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 17 (8 weeks before the average first fall frost on Oct 12).
Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Apr 18 | May 3 | May 26 |
| First 32°F frost in fall is before | Oct 26 | Oct 12 | Sep 29 |
How to read it: in spring there is a 10% chance of a frost after May 26, so that is a safe date for tender plants. In fall there is a 10% chance of frost before September 29. A hard freeze (28°F) usually ends around April 16.
Hardiness zone by ZIP code in Alpine
- 84004 zone 7a
Nearby cities
- Highland zone 7a, last frost May 3
- Cedar Hills zone 7a, last frost May 2
- American Fork zone 7a, last frost Apr 17
- Lehi zone 7a, last frost Apr 30
- Pleasant Grove zone 7a, last frost Apr 17
- Draper zone 7a, last frost Apr 18
- Lindon zone 7a, last frost Apr 17
- Saratoga Springs zone 7a, last frost Apr 30
Questions
What growing zone is Alpine, UT?
Alpine 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 Alpine?
The average last spring frost (32°F) in Alpine is May 3. There is still a 10% chance of frost until May 26.
When can I plant tomatoes in Alpine?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around May 10 – May 17. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Alpine, UT (USC00420061), 1.4 km (0.9 mi) from the city center, elevation 1554 m, based on 25 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.