When is the last frost in Salt Lake City, UT?

The average (50% probability) last spring frost in Salt Lake City is April 8, based on NOAA 1991–2020 normals. A 1-in-10 risk remains until April 30.

When is the first frost in Salt Lake City?

The average first fall frost in Salt Lake City is October 31, with a growing season of about 204 days.

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Salt Lake City, Utah frost dates

Average last spring frost: April 8. Average first fall frost: October 31. That gives a growing season of about 204 days. For frost-tender plants, a safer planting date is April 30, after which a freeze happens in only 1 year in 10.

Last frost (50%)

Apr 8

1-in-10 risk after Apr 30

First frost (50%)

Oct 31

1-in-10 risk before Oct 17

Growing season

204 days

median frost-free days

Hard freeze (28°F)

Mar 15

median last 28°F in spring

Frost risk by date

Chance of frost	Spring: frost after	Fall: frost before
90%	March 17	November 13
70%	March 31	November 5
50%	April 8	October 31
30%	April 16	October 25
10%	April 30	October 17

Read the spring column like this: there is a 10% chance of a 32°F freeze after April 30. These are NOAA probabilities for the Salt Lake City International Airport weather station (USW00024127, elevation 1288 m), 1991–2020.

Salt Lake City vegetable planting calendar

Dates count from the 50% last-frost date (April 8). For tomatoes, peppers and other frost-tender crops, waiting until the 10% date (Apr 30) is the cautious choice.

Crop	Start seeds indoors	Plant out
Beans	Mar 18	Apr 15 (usually sown directly in the garden)
Broccoli	Jan 28	Mar 11
Brussels sprouts	Jan 28	Mar 11
Cabbage	Jan 21	Mar 4
Cauliflower	Feb 11	Mar 25
Sweet corn	Mar 11	Apr 8 (usually sown directly in the garden)
Cucumbers	Mar 25	Apr 15
Kale	Jan 21	Mar 4
Leeks	Dec 24	Mar 4
Lettuce	Feb 18	Mar 25
Melons	Apr 1	Apr 22
Onions	Dec 17	Feb 25 (from seed; sets and transplants go out at the same time)
Peas	Feb 11	Mar 11 (usually sown directly in the garden)
Peppers	Feb 25	Apr 22
Squash	Apr 1	Apr 22
Tomatoes	Feb 11	Apr 8

Offsets from Oregon State University Extension's seed-starting table. "Plant out" means transplant, or sow directly for crops usually grown from seed.

Fall frost and season extension

The first fall freeze usually arrives around October 31. There's a 1-in-10 chance it comes before October 17. Harvest tender crops such as basil, tomatoes, peppers and squash before then, or cover them on cold nights. Cool-season crops like kale, cabbage and Brussels sprouts handle light frost, and often taste sweeter after it. A hard freeze (28°F) typically comes around November 10.

Nearby cities

City	Last frost (50%)	First frost (50%)	Distance
Grand Junction, CO	Apr 28	Oct 16	~341 km
Boise, ID	Apr 24	Oct 21	~474 km
Las Vegas, NV	Jan 20	Dec 15	~587 km
Cheyenne, WY	May 12	Oct 1	~604 km
Denver, CO	May 5	Oct 9	~623 km
Flagstaff, AZ	Jun 4	Sep 28	~626 km

More: all Utah frost dates