Growli

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:

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 frostmid-June
Average first fall frostmid-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:

Common questions

What can I plant in USDA Zone 1?

Zone 1 suits Birch (Betula), Quaking aspen, Lingonberry, Rhubarb, Cabbage, Kale, and more, based on its 60-day growing season and -60 to -50°F average minimum temperatures.

When is the last frost in Zone 1?

The average last spring frost in Zone 1 passes around mid-June, and the first fall frost arrives around mid-August. Wait until after the last frost date before planting tender crops outdoors.

How long is the growing season in Zone 1?

Zone 1 has roughly 60 frost-free growing days between the average last spring frost (mid-June) and the first fall frost (mid-August).

What is the temperature range of USDA Zone 1?

USDA Zone 1 is defined by average annual minimum temperatures of -60 to -50°F (-51 to -46°C).

When can I start planting in Zone 1?

Hardy cool-season crops can go outdoors a few weeks before the last frost (mid-June); tender crops should wait until 1–2 weeks after it. Start warm-season seeds indoors about 6–8 weeks before mid-June.

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