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

The average last spring frost (50% probability of 32°F) in Salt Lake City is around March 31, based on NOAA/NCEI 1991–2020 normals at the Salt Lake Triad Ctr, UT station (3.9 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Salt Lake City?

The average first fall frost in Salt Lake City, UT is around November 8, giving roughly a 224-day frost-free growing season.

What planting zone is Salt Lake City, UT?

Salt Lake City is in USDA plant hardiness zone 7b (average annual extreme minimum temperature 5 to 10°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Salt Lake City?

In Salt Lake City, UT the warmest month is July (avg high 91.4°F) and the coldest is January (avg low 27.6°F). It averages about 17.7″ of precipitation a year and 49″ of snow.

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Salt Lake City, UT Planting Calendar & Frost Dates

USDA hardiness zone 7b · ZIP 84115 · elevation 1305′ · NOAA & USDA data

Salt Lake City is in USDA hardiness zone 7b (winters can dip to 5 to 10°F), with a growing season of about 224 days between the average last spring frost (March 31) and first fall frost (November 8). The warmest month is July (avg high 91.4°F); the coldest is January (avg low 27.6°F). It averages 17.7″ of precipitation a year and 49″ of snow, mostly mid-winter. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp 5 to 10°F

Last spring frost

March 31

avg (50% prob, 32°F)

First fall frost

November 8

avg (50% prob, 32°F)

Growing season

224 days

frost-free window

Warmest month

July

avg high 91.4°F

Month-by-month typical weather in Salt Lake City

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Salt Lake Triad Ctr, UT (3.9 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	39.7	27.6	33.7	1.5	10.7
February	45.8	31.4	38.6	1.5	9.8
March	55.8	38.7	47.3	2	6.4
April	62.1	44	53	2.5	3.2
May	72.3	52	62.1	2.1	0.2
June	82.7	60.5	71.6	1.1	0
July	91.4	69.9	80.6	0.6	0
August	89.7	67.9	78.8	0.6	0
September	79.8	58.2	69	1.3	0
October	65.9	46.6	56.3	1.4	0.4
November	51.7	36.6	44.2	1.6	7.3
December	40.5	28.3	34.4	1.6	11

What to plant when in Salt Lake City

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: February 17 · Transplant out: April 7
Peppers	warm	Start seeds indoors: February 3 · Transplant out: April 14
Cucumbers	warm	Direct sow: April 7
Zucchini / squash	warm	Direct sow: April 7
Bush beans	warm	Direct sow: April 7
Sweet corn	warm	Direct sow: April 7
Basil	warm	Transplant out: April 7
Peas	cool	Sow (spring): February 24 · Sow (fall): September 13
Spinach	cool	Sow (spring): February 17 · Sow (fall): September 13
Lettuce	cool	Sow (spring): March 3 · Sow (fall): September 13
Kale	cool	Transplant (spring): March 10 · Sow (fall): August 30
Broccoli	cool	Transplant (spring): March 17
Carrots	cool	Sow (spring): March 10 · Sow (fall): August 30
Onions	cool	Transplant (spring): March 3
Potatoes	cool	Plant seed potatoes: March 17
Radishes	cool	Sow (spring): March 3 · Sow (fall): September 27

Dates are computed from Salt Lake City's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

Nearby cities in Utah

Sandy, UT West Jordan, UT South Jordan, UT Bountiful, UT Draper, UT Riverton, UT Lehi, UT Layton, UT

Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Salt Lake Triad Ctr, UT, 3.9 mi (confidence: high). Monthly weather normals: Salt Lake Triad Ctr, UT, 3.9 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.