When to plant in Magna, UT
USDA Zone 7bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Magna, Utah — all computed from Magna's nearest NOAA weather station.
Zone 7b means many perennials and even some tender shrubs overwinter in Magna, while your frost dates still decide when annuals go out.
The average last spring frost in Magna is now 8 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
GARFIELD · 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 Magna’s own odds, recorded at GARFIELD.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 5 | Apr 19 | Apr 2 | Oct 9 | Oct 23 | Nov 7 |
| 32°F | Apr 19 | Apr 3 | Mar 11 | Oct 18 | Nov 4 | Nov 17 |
| 28°F | Apr 6 | Mar 11 | Feb 20 | Oct 27 | Nov 13 | Nov 28 |
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 Magna, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 24 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.
Magna planting FAQ
When is the last spring frost in Magna, UT?
On average, the last spring frost in Magna is around April 3 (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 Magna, UT?
The first fall frost in Magna typically arrives around November 4 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Magna in?
Magna 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 Magna?
There are roughly 215 frost-free days in Magna (a long growing season), running from the average last frost around April 3 to the first fall frost near November 4.
When should I plant tomatoes in Magna?
In Magna, start tomato seeds indoors around February 6–February 20, then transplant seedlings outdoors around April 10 once the danger of frost has passed.
Never miss a window in Magna
An email when it’s time to start seeds, transplant, and sow — timed to Magna’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- West Valley City · 16 km
- Stansbury Park · 17 km
- Kearns · 19 km
- Salt Lake City · 21 km
- Taylorsville · 23 km
- West Jordan · 23 km
- North Salt Lake · 24 km
- South Salt Lake · 25 km
Frost dates recorded at GARFIELD, 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 Magna, UT — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00423097. Retrieved from https://blissgarden.com/utah/magna.