When is the last frost in Riverton, UT?

The average last spring frost (50% probability of 32°F) in Riverton is around April 18, based on NOAA/NCEI 1991–2020 normals at the Draper-point Of Mtn, UT station (2.4 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 Riverton?

The average first fall frost in Riverton, UT is around October 22, giving roughly a 185-day frost-free growing season.

What planting zone is Riverton, UT?

Riverton is in USDA plant hardiness zone 7a (average annual extreme minimum temperature 0 to 5°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Riverton?

In Riverton, UT the warmest month is July (avg high 89.5°F) and the coldest is January (avg low 21.6°F). It averages about 21.1″ of precipitation a year and 74.4″ of snow.

Home › Utah › Riverton

Riverton, UT Planting Calendar & Frost Dates

USDA hardiness zone 7a · ZIP 84065 · elevation 1555′ · NOAA & USDA data

Riverton is in USDA hardiness zone 7a (winters can dip to 0 to 5°F), with a growing season of about 185 days between the average last spring frost (April 18) and first fall frost (October 22). The warmest month is July (avg high 89.5°F); the coldest is January (avg low 21.6°F). It averages 21.1″ of precipitation a year and 74.4″ 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 0 to 5°F

Last spring frost

April 18

avg (50% prob, 32°F)

First fall frost

October 22

avg (50% prob, 32°F)

Growing season

185 days

frost-free window

Warmest month

July

avg high 89.5°F

Month-by-month typical weather in Riverton

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Alpine, UT (9.3 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	38.6	21.6	30.1	2.5	17.4
February	44	24.9	34.5	2	13.6
March	54.4	31.8	43.1	2	9.6
April	60.9	36.8	48.8	2.5	6.2
May	70.6	43.9	57.2	2.4	0.5
June	82.2	51.4	66.8	1	0
July	89.5	58.5	74	0.6	0
August	87.3	57.6	72.4	1	0
September	78.6	48.9	63.7	1.3	0
October	65.1	38.8	51.9	1.8	1.6
November	50.2	29.4	39.8	1.6	8
December	38.5	21.9	30.2	2.3	17.5

What to plant when in Riverton

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: March 7 · Transplant out: April 25
Peppers	warm	Start seeds indoors: February 21 · Transplant out: May 2
Cucumbers	warm	Direct sow: April 25
Zucchini / squash	warm	Direct sow: April 25
Bush beans	warm	Direct sow: April 25
Sweet corn	warm	Direct sow: April 25
Basil	warm	Transplant out: April 25
Peas	cool	Sow (spring): March 14 · Sow (fall): August 27
Spinach	cool	Sow (spring): March 7 · Sow (fall): August 27
Lettuce	cool	Sow (spring): March 21 · Sow (fall): August 27
Kale	cool	Transplant (spring): March 28 · Sow (fall): August 13
Broccoli	cool	Transplant (spring): April 4
Carrots	cool	Sow (spring): March 28 · Sow (fall): August 13
Onions	cool	Transplant (spring): March 21
Potatoes	cool	Plant seed potatoes: April 4
Radishes	cool	Sow (spring): March 21 · Sow (fall): September 10

Dates are computed from Riverton'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.

Want the exact dates for your yard? →
Look up your precise ZIP-code frost dates and a full 26-crop planting calendar on our free interactive tool.
Open the frost & planting tool

🌾 Get a frost reminder

One email in early spring and early fall with the dates for your area. No spam.

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

Draper, UT South Jordan, UT Lehi, UT West Jordan, UT Sandy, UT Salt Lake City, UT Orem, UT Provo, 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 — Draper-point Of Mtn, UT, 2.4 mi (confidence: high). Monthly weather normals: Alpine, UT, 9.3 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.