When is the last frost in Yuma, AZ?

The average last spring frost (50% probability of 32°F) in Yuma is around January 11, based on NOAA/NCEI 1991–2020 normals at the Yuma 27 Ene, AZ station (13.4 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 Yuma?

The average first fall frost in Yuma, AZ is around December 21, giving roughly a 347-day frost-free growing season.

What planting zone is Yuma, AZ?

Yuma is in USDA plant hardiness zone 9a (average annual extreme minimum temperature 20 to 25°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Yuma?

In Yuma, AZ the warmest month is July (avg high 106°F) and the coldest is December (avg low 41.5°F). It averages about 4″ of precipitation a year.

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Yuma, AZ Planting Calendar & Frost Dates

USDA hardiness zone 9a · ZIP 85365 · elevation 189′ · NOAA & USDA data

Yuma is in USDA hardiness zone 9a (winters can dip to 20 to 25°F), with a growing season of about 347 days between the average last spring frost (January 11) and first fall frost (December 21). The warmest month is July (avg high 106°F); the coldest is December (avg low 41.5°F). It averages 4″ of precipitation a year. 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 20 to 25°F

Last spring frost

January 11

avg (50% prob, 32°F)

First fall frost

December 21

avg (50% prob, 32°F)

Growing season

347 days

frost-free window

Warmest month

July

avg high 106°F

Month-by-month typical weather in Yuma

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Yuma 27 Ene, AZ (13.4 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	68.4	43.3	55.9	0.6	–
February	71.9	45.4	58.6	0.6	–
March	78.8	50.5	64.6	0.4	–
April	85.4	55.7	70.5	0.1	–
May	93.1	62.3	77.7	0	–
June	102.5	70.5	86.5	0	–
July	106	80	93	0.3	–
August	105.3	79.7	92.5	0.6	–
September	100.2	72.6	86.4	0.4	–
October	89.5	59.9	74.7	0.2	–
November	76.7	49.3	63	0.4	–
December	67.3	41.5	54.4	0.4	–

What to plant when in Yuma

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: November 30 · Transplant out: January 18
Peppers	warm	Start seeds indoors: November 16 · Transplant out: January 25
Cucumbers	warm	Direct sow: January 18
Zucchini / squash	warm	Direct sow: January 18
Bush beans	warm	Direct sow: January 18
Sweet corn	warm	Direct sow: January 18
Basil	warm	Transplant out: January 18
Peas	cool	Sow (spring): December 7 · Sow (fall): October 26
Spinach	cool	Sow (spring): November 30 · Sow (fall): October 26
Lettuce	cool	Sow (spring): December 14 · Sow (fall): October 26
Kale	cool	Transplant (spring): December 21 · Sow (fall): October 12
Broccoli	cool	Transplant (spring): December 28
Carrots	cool	Sow (spring): December 21 · Sow (fall): October 12
Onions	cool	Transplant (spring): December 14
Potatoes	cool	Plant seed potatoes: December 28
Radishes	cool	Sow (spring): December 14 · Sow (fall): November 9

Dates are computed from Yuma'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 Arizona

Buckeye, AZ Lake Havasu City, AZ Goodyear, AZ Avondale, AZ Surprise, AZ Peoria, AZ Glendale, AZ Phoenix, AZ

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 — Yuma 27 Ene, AZ, 13.4 mi (confidence: medium). Monthly weather normals: Yuma 27 Ene, AZ, 13.4 mi (confidence: medium). 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.