When to plant in Alpine, UT
USDA Zone 7aEverything below — frost dates, hardiness zone, and what to plant when in Alpine, Utah — is derived from the closest NOAA station with complete climate normals.
In zone 7a, Alpine supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
ALPINE · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Alpine’s own odds, recorded at ALPINE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 10 | May 20 | May 4 | Sep 18 | Oct 1 | Oct 15 |
| 32°F | May 26 | May 3 | Apr 18 | Sep 29 | Oct 12 | Oct 26 |
| 28°F | May 5 | Apr 16 | Mar 29 | Oct 8 | Oct 24 | Nov 8 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Alpine, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 11 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Alpine planting FAQ
When is the last spring frost in Alpine, UT?
Alpine's average last spring frost falls near May 3 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Alpine, UT?
The first fall frost in Alpine typically arrives around October 12 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Alpine in?
Alpine is in USDA hardiness zone 7a. In zone 7a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Alpine?
Alpine has about 162 frost-free days — a moderate growing season — between the average last spring frost (May 3) and first fall frost (October 12).
When should I plant tomatoes in Alpine?
For Alpine, sow tomatoes indoors about March 8–March 22 and move the seedlings out around May 10, after the last spring frost.
Never miss a window in Alpine
An email when it’s time to start seeds, transplant, and sow — timed to Alpine’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Highland · 4 km
- Draper · 9 km
- American Fork · 10 km
- Lehi · 10 km
- Pleasant Grove · 11 km
- Sandy · 14 km
- Lindon · 14 km
- Bluffdale · 14 km
Frost dates recorded at ALPINE, 0 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Alpine, UT — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00420061. Retrieved from https://blissgarden.com/utah/alpine.