When is the last frost in Sierra Vista, AZ?

The average last spring frost (50% probability of 32°F) in Sierra Vista is around April 5, based on NOAA/NCEI 1991–2020 normals at the Sierra Vista, AZ station (6.6 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 Sierra Vista?

The average first fall frost in Sierra Vista, AZ is around November 9, giving roughly a 216-day frost-free growing season.

What planting zone is Sierra Vista, AZ?

Sierra Vista is in USDA plant hardiness zone 8b (average annual extreme minimum temperature 15 to 20°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Sierra Vista?

In Sierra Vista, AZ the warmest month is June (avg high 93.9°F) and the coldest is January (avg low 29.5°F). It averages about 13″ of precipitation a year and 0.4″ of snow.

Home › Arizona › Sierra Vista

Sierra Vista, AZ Planting Calendar & Frost Dates

USDA hardiness zone 8b · ZIP 85635 · elevation 1404′ · NOAA & USDA data

Sierra Vista is in USDA hardiness zone 8b (winters can dip to 15 to 20°F), with a growing season of about 216 days between the average last spring frost (April 5) and first fall frost (November 9). The warmest month is June (avg high 93.9°F); the coldest is January (avg low 29.5°F). It averages 13″ of precipitation a year and 0.4″ 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 15 to 20°F

Last spring frost

April 5

avg (50% prob, 32°F)

First fall frost

November 9

avg (50% prob, 32°F)

Growing season

216 days

frost-free window

Warmest month

June

avg high 93.9°F

Month-by-month typical weather in Sierra Vista

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Sierra Vista, AZ (6.6 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	61.3	29.5	45.4	0.8	0.4
February	64.4	32.6	48.5	0.6	0
March	70.5	37.5	54	0.5	0
April	77.5	42.8	60.2	0.3	0
May	85	50.4	67.7	0.2	0
June	93.9	59.6	76.8	0.5	0
July	91.5	62.5	77	3.5	0
August	89.5	61.5	75.5	3.3	0
September	86.8	56.7	71.7	1.3	0
October	80	47.1	63.5	0.6	0
November	70	36.8	53.4	0.5	0
December	61.6	29.5	45.6	0.9	0

What to plant when in Sierra Vista

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: February 22 · Transplant out: April 12
Peppers	warm	Start seeds indoors: February 8 · Transplant out: April 19
Cucumbers	warm	Direct sow: April 12
Zucchini / squash	warm	Direct sow: April 12
Bush beans	warm	Direct sow: April 12
Sweet corn	warm	Direct sow: April 12
Basil	warm	Transplant out: April 12
Peas	cool	Sow (spring): March 1 · Sow (fall): September 14
Spinach	cool	Sow (spring): February 22 · Sow (fall): September 14
Lettuce	cool	Sow (spring): March 8 · Sow (fall): September 14
Kale	cool	Transplant (spring): March 15 · Sow (fall): August 31
Broccoli	cool	Transplant (spring): March 22
Carrots	cool	Sow (spring): March 15 · Sow (fall): August 31
Onions	cool	Transplant (spring): March 8
Potatoes	cool	Plant seed potatoes: March 22
Radishes	cool	Sow (spring): March 8 · Sow (fall): September 28

Dates are computed from Sierra Vista'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 — Sierra Vista, AZ, 6.6 mi (confidence: high). Monthly weather normals: Sierra Vista, AZ, 6.6 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.