When to plant in Roy, UT
USDA Zone 7aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Roy, Utah — all computed from Roy's nearest NOAA weather station.
In zone 7a, Roy supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
OGDEN HINKLEY AP · 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 Roy’s own odds, recorded at OGDEN HINKLEY AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 31 | May 8 | Apr 22 | Sep 28 | Oct 11 | Oct 25 |
| 32°F | May 10 | Apr 22 | Apr 4 | Oct 7 | Oct 22 | Nov 6 |
| 28°F | Apr 21 | Apr 3 | Mar 13 | Oct 18 | Nov 2 | Nov 17 |
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 Roy, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 12 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.
Roy planting FAQ
When is the last spring frost in Roy, UT?
On average, the last spring frost in Roy is around April 22 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Roy, UT?
Expect Roy's first fall frost near October 22 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Roy in?
Roy 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 Roy?
Roy has about 183 frost-free days — a moderate growing season — between the average last spring frost (April 22) and first fall frost (October 22).
When should I plant tomatoes in Roy?
For Roy, sow tomatoes indoors about February 25–March 11 and move the seedlings out around April 29, after the last spring frost.
Never miss a window in Roy
An email when it’s time to start seeds, transplant, and sow — timed to Roy’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Clinton · 4 km
- West Haven · 4 km
- West Point · 7 km
- South Ogden · 8 km
- Clearfield · 9 km
- Ogden · 9 km
- Syracuse · 10 km
- Layton · 13 km
Frost dates recorded at OGDEN HINKLEY AP, 4 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 Roy, UT — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00024126. Retrieved from https://blissgarden.com/utah/roy.