When to plant in Cottonwood Heights, UT
USDA Zone 7bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Cottonwood Heights, Utah — all computed from Cottonwood Heights's nearest NOAA weather station.
Zone 7b means many perennials and even some tender shrubs overwinter in Cottonwood Heights, while your frost dates still decide when annuals go out.
Frost probability
COTTONWOOD WEIR · 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 Cottonwood Heights’s own odds, recorded at COTTONWOOD WEIR.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 9 | May 13 | Apr 25 | Sep 27 | Oct 11 | Oct 27 |
| 32°F | May 30 | Apr 29 | Apr 10 | Oct 6 | Oct 22 | Nov 7 |
| 28°F | May 13 | Apr 12 | Mar 21 | Oct 17 | Nov 1 | Nov 18 |
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 Cottonwood Heights, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 15 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.
Cottonwood Heights planting FAQ
When is the last spring frost in Cottonwood Heights, UT?
On average, the last spring frost in Cottonwood Heights is around April 29 (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 Cottonwood Heights, UT?
In Cottonwood Heights, the first 32°F freeze of fall lands around October 22 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Cottonwood Heights in?
Cottonwood Heights is in USDA hardiness zone 7b. In zone 7b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Cottonwood Heights?
There are roughly 176 frost-free days in Cottonwood Heights (a moderate growing season), running from the average last frost around April 29 to the first fall frost near October 22.
When should I plant tomatoes in Cottonwood Heights?
In Cottonwood Heights, start tomato seeds indoors around March 4–March 18, then transplant seedlings outdoors around May 6 once the danger of frost has passed.
Never miss a window in Cottonwood Heights
An email when it’s time to start seeds, transplant, and sow — timed to Cottonwood Heights’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Holladay · 5 km
- Sandy · 6 km
- Midvale · 7 km
- Murray · 7 km
- Millcreek · 8 km
- Taylorsville · 12 km
- South Salt Lake · 12 km
- Draper · 14 km
Frost dates recorded at COTTONWOOD WEIR, 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 Cottonwood Heights, UT — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00421759. Retrieved from https://blissgarden.com/utah/cottonwood-heights.