Phoenix Deer Valley Municipal Airport, AZ Frost Dates & Growing Season

The two dates every Phoenix Deer Valley Municipal Airport garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Jan 8
~50% chance of frost after
First fall frost
Dec 25
~50% chance of frost before
Growing season
351 days
frost-free stretch
USDA zone
≈ 9b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Dec 16 Jan 8 Feb 12
First fall frost Jan 23 Dec 25 Dec 5
Hard freeze (28°F), median last Jan 8 · first Jan 7

Computed from NOAA 1991–2020 climate normals at the PHOENIX DEER VALLEY MUNI AP station. "Safe" means frost past that date happens only about one year in ten. Your exact garden can still run days either way with elevation and terrain — check your own ZIP with the frost date lookup.

Planting windows for Phoenix Deer Valley Municipal Airport

Computed from Phoenix Deer Valley Municipal Airport's own frost dates. Click any crop for the full zone-9 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Nov 13 – Nov 27 Jan 15 – Jan 22
🫑 Peppers Oct 30 – Nov 13 Jan 22 – Jan 29
🥬 Lettuce Nov 27 – Dec 11 Dec 11 – Dec 25 Dec 11 – Jan 8
🫛 Peas Nov 27 – Dec 11
🥕 Carrots Dec 18 – Jan 8
🥦 Broccoli Nov 20 – Dec 4 Dec 18 – Jan 1
🥬 Kale Nov 27 – Dec 11 Dec 11 – Dec 25 Dec 11 – Dec 25
🥒 Cucumbers Dec 11 – Dec 18 Jan 15 – Jan 22 Jan 15 – Jan 22
🥒 Zucchini Dec 11 – Dec 18 Jan 15 – Jan 22 Jan 15 – Jan 22
🫘 Green Beans (Bush) Jan 15 – Jan 22
🌽 Sweet Corn Jan 15 – Jan 22
🌿 Basil Nov 27 – Dec 11 Jan 15 – Jan 22 Jan 22 – Jan 29
🧄 Garlic Fall: Nov 13 – Dec 11

Want this for all 50 crops, or as a printable seed-shelf schedule? Use the planting calendar and the seed starting scheduler — both can use Phoenix Deer Valley Municipal Airport's dates automatically after a lookup.

Reading the season in Phoenix Deer Valley Municipal Airport

With roughly 351 frost-free days, Phoenix Deer Valley Municipal Airport gardens fit long-season crops — melons, winter squash, sweet potatoes — with room left for spring and fall rounds of greens and roots. The first frost around Dec 25 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Phoenix Deer Valley Municipal Airport, AZ?

The average last spring frost in Phoenix Deer Valley Municipal Airport is around Jan 8, based on 1991–2020 climate normals. That's a median — about half of years see a later frost, so tender crops are safest going out a week or two after this date.

When is the first frost in Phoenix Deer Valley Municipal Airport, AZ?

The average first fall frost in Phoenix Deer Valley Municipal Airport arrives around Dec 25. Crops still in the garden need to mature before then, and frost-tender plants need harvesting or protection as the date approaches.

How long is the growing season in Phoenix Deer Valley Municipal Airport?

About 351 frost-free days on average, from Jan 8 to Dec 25. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Phoenix Deer Valley Municipal Airport in?

USDA zone 9b on the 2023 Plant Hardiness Zone Map. Note that zones describe winter cold, not frost timing — these frost dates are the numbers to plan plantings around.