Wickenburg, AZ Frost Dates & Growing Season

The two dates every Wickenburg garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Mar 7
~50% chance of frost after
First fall frost
Nov 20
~50% chance of frost before
Growing season
258 days
frost-free stretch
USDA zone
≈ 9b
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Feb 14 Mar 7 Apr 8
First fall frost Dec 5 Nov 20 Nov 4
Hard freeze (28°F), median last Feb 14 · first Dec 2

Computed from NOAA 1991–2020 climate normals at the WICKENBURG 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 Wickenburg

Computed from Wickenburg'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 Jan 10 – Jan 24 Mar 14 – Mar 21
🫑 Peppers Dec 27 – Jan 10 Mar 21 – Mar 28
🥬 Lettuce Jan 24 – Feb 7 Feb 7 – Feb 21 Feb 7 – Mar 7
🫛 Peas Jan 24 – Feb 7
🥕 Carrots Feb 14 – Mar 7
🥦 Broccoli Jan 17 – Jan 31 Feb 14 – Feb 28
🥬 Kale Jan 24 – Feb 7 Feb 7 – Feb 21 Feb 7 – Feb 21
🥒 Cucumbers Feb 7 – Feb 14 Mar 14 – Mar 21 Mar 14 – Mar 21
🥒 Zucchini Feb 7 – Feb 14 Mar 14 – Mar 21 Mar 14 – Mar 21
🫘 Green Beans (Bush) Mar 14 – Mar 21
🌽 Sweet Corn Mar 14 – Mar 21
🌿 Basil Jan 24 – Feb 7 Mar 14 – Mar 21 Mar 21 – Mar 28
🧄 Garlic Fall: Oct 9 – Nov 6

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 Wickenburg's dates automatically after a lookup.

Reading the season in Wickenburg

With roughly 258 frost-free days, Wickenburg 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 Nov 20 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Wickenburg, AZ?

The average last spring frost in Wickenburg is around Mar 7, 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 Wickenburg, AZ?

The average first fall frost in Wickenburg arrives around Nov 20. 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 Wickenburg?

About 258 frost-free days on average, from Mar 7 to Nov 20. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Wickenburg 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.