When is the last frost in Prescott Valley, AZ?

The average last spring frost (50% probability of 32°F) in Prescott Valley is around April 30, based on NOAA/NCEI 1991–2020 normals at the Prescott, AZ station (6.1 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 Prescott Valley?

The average first fall frost in Prescott Valley, AZ is around October 20, giving roughly a 172-day frost-free growing season.

What planting zone is Prescott Valley, AZ?

Prescott Valley 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 Prescott Valley?

In Prescott Valley, AZ the warmest month is July (avg high 89.6°F) and the coldest is December (avg low 23.6°F). It averages about 16.5″ of precipitation a year and 10.2″ of snow.

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Prescott Valley, AZ Planting Calendar & Frost Dates

USDA hardiness zone 7b · ZIP 86314 · elevation 1587′ · NOAA & USDA data

Prescott Valley is in USDA hardiness zone 7b (winters can dip to 5 to 10°F), with a growing season of about 172 days between the average last spring frost (April 30) and first fall frost (October 20). The warmest month is July (avg high 89.6°F); the coldest is December (avg low 23.6°F). It averages 16.5″ of precipitation a year and 10.2″ 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

April 30

avg (50% prob, 32°F)

First fall frost

October 20

avg (50% prob, 32°F)

Growing season

172 days

frost-free window

Warmest month

July

avg high 89.6°F

Month-by-month typical weather in Prescott Valley

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Prescott, AZ (6.1 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	52.6	23.8	38.2	1.5	1.9
February	55.2	26.4	40.8	1.8	3.1
March	61.2	31.6	46.4	1.5	2.5
April	67.8	37.3	52.5	0.6	0.4
May	76.3	45	60.6	0.5	0
June	87	53.6	70.3	0.2	0
July	89.6	61	75.3	2.7	0
August	87.2	59.7	73.5	2.8	0
September	82.4	52.2	67.3	1.6	0
October	72.9	40.1	56.5	1	0
November	61.6	29.8	45.7	0.9	0.9
December	51.9	23.6	37.7	1.5	1.4

What to plant when in Prescott Valley

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: March 19 · Transplant out: May 7
Peppers	warm	Start seeds indoors: March 5 · Transplant out: May 14
Cucumbers	warm	Direct sow: May 7
Zucchini / squash	warm	Direct sow: May 7
Bush beans	warm	Direct sow: May 7
Sweet corn	warm	Direct sow: May 7
Basil	warm	Transplant out: May 7
Peas	cool	Sow (spring): March 26 · Sow (fall): August 25
Spinach	cool	Sow (spring): March 19 · Sow (fall): August 25
Lettuce	cool	Sow (spring): April 2 · Sow (fall): August 25
Kale	cool	Transplant (spring): April 9 · Sow (fall): August 11
Broccoli	cool	Transplant (spring): April 16
Carrots	cool	Sow (spring): April 9 · Sow (fall): August 11
Onions	cool	Transplant (spring): April 2
Potatoes	cool	Plant seed potatoes: April 16
Radishes	cool	Sow (spring): April 2 · Sow (fall): September 8

Dates are computed from Prescott Valley'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

Prescott, AZ Flagstaff, AZ Peoria, AZ Surprise, AZ Glendale, AZ Scottsdale, AZ Phoenix, AZ Goodyear, 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 — Prescott, AZ, 6.1 mi (confidence: high). Monthly weather normals: Prescott, AZ, 6.1 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.