USDA hardiness zone lookup
Wasilla, AK — USDA Zone 4a
Wasilla, Alaska · 103-day growing season
Frost dates and growing season in Wasilla
| USDA hardiness zone | Zone 4a |
|---|---|
| Average last spring frost | May 25 |
| Average first fall frost | September 5 |
| Growing season length | ~103 days |
| Temperature range (F) | -30 to -20°F |
| Temperature range (C) | -34 to -29°C |
All of Wasilla's mapped ZIP codes fall in the same hardiness band, Zone 4a.
These are 50%-probability averages modeled from Wasilla's USDA hardiness zone and regional climate normals — not a single-station reading. In a typical year the last spring frost will have passed by May 25, but a colder-than-average year can run 1-2 weeks later. Plant tender crops (tomatoes, peppers, basil) once both soil and night temperatures are consistently warm — a thermometer beats the calendar.
Growing season in Wasilla
Wasilla, Alaska sits in USDA Zone 4a, with roughly 103 frost-free days between an average last spring frost around May 25 and a first fall frost around September 5. That is a short season — start warm-season crops indoors 6-8 weeks early and lean on quick-maturing, cold-tolerant cultivars to beat the first fall frost.
What grows in Wasilla
Wasilla falls in USDA Zone 4a, so the same hardiness constraints apply as the full Zone 4 guide. Vegetables, herbs, and fruit trees rated to Zone 4a (or hardier) will overwinter here in a typical year.
- Apple, pear, plum, sour cherry
- Blueberries (highbush)
- Raspberries
- Strawberries
- Tomatoes
- Peppers (short-season)
- Cucumbers
- Beans
- Squash (summer + winter)
- Garlic
What to plant in Wasilla this week
Wasilla's last frost is around May 25. This is the spring transplant window — start tomatoes and peppers indoors if you haven't, and direct-sow cold-tolerant crops now.
- When to plant tomatoes in zone 4
- When to plant peppers in zone 4
- When to plant basil in zone 4
- When to plant bush beans in zone 4
- When to plant cucumbers in zone 4
Full planting calendar for Wasilla
Crop-by-crop sowing, transplant, and harvest dates calibrated to zone 4 averages:
- When to plant tomatoes in zone 4
- When to plant peppers in zone 4
- When to plant basil in zone 4
- When to plant garlic in zone 4
- When to plant lettuce in zone 4
- When to plant bush beans in zone 4
- When to plant cucumbers in zone 4
- When to plant summer squash in zone 4
- When to plant peas in zone 4
- When to plant carrots in zone 4
ZIP codes in Wasilla
Drill down to the precise frost window and planting calendar for a specific ZIP in Wasilla:
Local microclimate notes
Zone tables give you the average — but Wasillagardens vary. South-facing walls and paved areas can run a full half-zone warmer than the published rating. Low-lying spots, frost pockets, and shaded north sides can run colder. If you've gardened here a few seasons, your own frost record — the last time you actually got frost damage — beats any national average.
Source and methodology
Hardiness zone from the USDA Plant Hardiness Zone Map (2023 revision). Frost-date and growing-season figures are modeled from Wasilla's USDA hardiness zone and regional NOAA 1991-2020 climate normals — zone-level estimates, not a per-station record, so treat them as planning guidance and confirm against your own local frost history. Crop recommendations draw on US Cooperative Extension references, curated by the Growli editorial team. Last reviewed June 2026.
Other cities in Alaska
- Anchorage, AK — USDA Zone 5a
- Fairbanks, AK — USDA Zone 2a
- Homer, AK — USDA Zone 5b
- Juneau, AK — USDA Zone 6b
- Ketchikan, AK — USDA Zone 7a
- Palmer, AK — USDA Zone 4a
- All of Alaska by zone