USDA hardiness zone
Zone 1 — -60 to -50°F
Interior Alaska (Fairbanks region) · 60-day growing season
What grows in Zone 1
Zone 1 suits the following plants based on temperature tolerance and growing-season length:
- Birch (Betula)
- Quaking aspen
- Lingonberry
- Rhubarb
- Cabbage
- Kale
- Radishes
- Lettuce (cold-hardy)
- Potatoes (short-season)
- Peas
Climate notes for Zone 1
Outdoor flowering ornamentals are largely impossible. Greenhouse and cold-frame growing are the norm. Garlic must be planted very early in fall.
Frost dates and timing
| Average last spring frost | mid-June |
|---|---|
| Average first fall frost | mid-August |
| Growing season length | ~60 days |
| Temperature range (F) | -60 to -50°F |
| Temperature range (C) | -51 to -46°C |
These are zone-wide averages. Local microclimates (south-facing slopes, urban heat, lakeside warmth) can shift dates by 1-2 weeks within the same zone.
Source and methodology
Temperature ranges from the USDA Plant Hardiness Zone Map (2023). Frost-date averages from NOAA Climate Data Online national averages within each zone. Plant recommendations curated by the Growli editorial team from US extension service references.
What to plant in Zone 1
Crop-by-crop sowing, transplant, and harvest dates for zone 1:
- When to plant garlic in zone 1
- When to plant lettuce in zone 1
- When to plant peas in zone 1
- When to plant carrots in zone 1