Port Alexander, AK Frost Dates & Growing Season

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

Last spring frost
Apr 18
~50% chance of frost after
First fall frost
Nov 5
~50% chance of frost before
Growing season
201 days
frost-free stretch
USDA zone
≈ 6a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Mar 31 Apr 18 May 5
First fall frost Nov 25 Nov 5 Oct 16
Hard freeze (28°F), median last Mar 26 · first Nov 24

Computed from NOAA 1991–2020 climate normals at the PORT ALEXANDER 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 Port Alexander

Computed from Port Alexander's own frost dates. Click any crop for the full zone-6 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Feb 21 – Mar 7 Apr 25 – May 2
🫑 Peppers Feb 7 – Feb 21 May 2 – May 9
🥬 Lettuce Mar 7 – Mar 21 Mar 21 – Apr 4 Mar 21 – Apr 18
🫛 Peas Mar 7 – Mar 21
🥕 Carrots Mar 28 – Apr 18
🥦 Broccoli Feb 28 – Mar 14 Mar 28 – Apr 11
🥬 Kale Mar 7 – Mar 21 Mar 21 – Apr 4 Mar 21 – Apr 4
🥒 Cucumbers Mar 21 – Mar 28 Apr 25 – May 2 Apr 25 – May 2
🥒 Zucchini Mar 21 – Mar 28 Apr 25 – May 2 Apr 25 – May 2
🫘 Green Beans (Bush) Apr 25 – May 2
🌽 Sweet Corn Apr 25 – May 2
🌿 Basil Mar 7 – Mar 21 Apr 25 – May 2 May 2 – May 9
🧄 Garlic Fall: Sep 24 – Oct 22

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 Port Alexander's dates automatically after a lookup.

Reading the season in Port Alexander

With roughly 201 frost-free days, Port Alexander 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 5 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Port Alexander, AK?

The average last spring frost in Port Alexander is around Apr 18, 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 Port Alexander, AK?

The average first fall frost in Port Alexander arrives around Nov 5. 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 Port Alexander?

About 201 frost-free days on average, from Apr 18 to Nov 5. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Port Alexander in?

USDA zone 6a 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.