When to plant in Grantsville, UT
USDA Zone 7aGrantsville, Utah frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 7a, Grantsville supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
GRANTSVILLE 2W · 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 Grantsville’s own odds, recorded at GRANTSVILLE 2W.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 5 | May 16 | May 1 | Sep 21 | Oct 4 | Oct 17 |
| 32°F | May 19 | May 2 | Apr 17 | Sep 30 | Oct 14 | Oct 27 |
| 28°F | May 5 | Apr 17 | Mar 31 | Oct 8 | Oct 25 | 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 Grantsville, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 26 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.
Grantsville planting FAQ
When is the last spring frost in Grantsville, UT?
Plan for the last spring frost in Grantsville around May 2 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Grantsville, UT?
In Grantsville, the first 32°F freeze of fall lands around October 14 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Grantsville in?
Grantsville 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 Grantsville?
Grantsville has about 165 frost-free days — a moderate growing season — between the average last spring frost (May 2) and first fall frost (October 14).
When should I plant tomatoes in Grantsville?
For Grantsville, sow tomatoes indoors about March 7–March 21 and move the seedlings out around May 9, after the last spring frost.
Never miss a window in Grantsville
An email when it’s time to start seeds, transplant, and sow — timed to Grantsville’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Stansbury Park · 14 km
- Tooele · 16 km
- Magna · 29 km
- Kearns · 39 km
- West Jordan · 40 km
- West Valley City · 40 km
- Herriman · 40 km
- South Jordan · 41 km
Frost dates recorded at GRANTSVILLE 2W, 3 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 Grantsville, UT — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00423348. Retrieved from https://blissgarden.com/utah/grantsville.