When is the last frost in Apache Junction, AZ?

The average last spring frost (50% probability of 32°F) in Apache Junction is around February 11, based on NOAA/NCEI 1991–2020 normals at the Apache Junction 5 Ne, AZ station (4.5 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 Apache Junction?

The average first fall frost in Apache Junction, AZ is around December 10, giving roughly a 304-day frost-free growing season.

What planting zone is Apache Junction, AZ?

Apache Junction is in USDA plant hardiness zone 9b (average annual extreme minimum temperature 25 to 30°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Apache Junction?

In Apache Junction, AZ the warmest month is July (avg high 105.2°F) and the coldest is December (avg low 42.2°F). It averages about 12.6″ of precipitation a year.

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Apache Junction, AZ Planting Calendar & Frost Dates

USDA hardiness zone 9b · ZIP 85117 · elevation 631′ · NOAA & USDA data

Apache Junction is in USDA hardiness zone 9b (winters can dip to 25 to 30°F), with a growing season of about 304 days between the average last spring frost (February 11) and first fall frost (December 10). The warmest month is July (avg high 105.2°F); the coldest is December (avg low 42.2°F). It averages 12.6″ 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 25 to 30°F

Last spring frost

February 11

avg (50% prob, 32°F)

First fall frost

December 10

avg (50% prob, 32°F)

Growing season

304 days

frost-free window

Warmest month

July

avg high 105.2°F

Month-by-month typical weather in Apache Junction

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Apache Junction 5 Ne, AZ (4.5 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)
January	66.7	42.8	54.7	1.5
February	70.1	43.9	57	1.7
March	77.1	47.6	62.4	1.3
April	84.7	52.6	68.6	0.5
May	93.4	60.4	76.9	0.3
June	103	69.1	86	0.1
July	105.2	77	91.1	1.4
August	103.8	76.4	90.1	1.5
September	99.2	71.2	85.2	1.1
October	88.4	60.1	74.2	0.7
November	75.6	49.8	62.7	1
December	65.6	42.2	53.9	1.5

What to plant when in Apache Junction

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: December 31 · Transplant out: February 18
Peppers	warm	Start seeds indoors: December 17 · Transplant out: February 25
Cucumbers	warm	Direct sow: February 18
Zucchini / squash	warm	Direct sow: February 18
Bush beans	warm	Direct sow: February 18
Sweet corn	warm	Direct sow: February 18
Basil	warm	Transplant out: February 18
Peas	cool	Sow (spring): January 7 · Sow (fall): October 15
Spinach	cool	Sow (spring): December 31 · Sow (fall): October 15
Lettuce	cool	Sow (spring): January 14 · Sow (fall): October 15
Kale	cool	Transplant (spring): January 21 · Sow (fall): October 1
Broccoli	cool	Transplant (spring): January 28
Carrots	cool	Sow (spring): January 21 · Sow (fall): October 1
Onions	cool	Transplant (spring): January 14
Potatoes	cool	Plant seed potatoes: January 28
Radishes	cool	Sow (spring): January 14 · Sow (fall): October 29

Dates are computed from Apache Junction'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.

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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 — Apache Junction 5 Ne, AZ, 4.5 mi (confidence: high). Monthly weather normals: Apache Junction 5 Ne, AZ, 4.5 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.