What Grows in US Zone 1a?
Extreme subarctic cold. Only the hardiest perennials and short-season cool crops are viable in the brief summer window.
Last frost
First frost
Frost-free days
Plants that grow well
In Zone 1a, 2 plants grow well, 24 are borderline. Your growing season is 14 days (early July to mid-July).
What grows well in Zone 1a
Borderline — needs care
Spinach
Borderline
Kale
Borderline
Broccoli
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Radish
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Beets
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Onion
Borderline
Peas
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Swiss Chard
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Arugula
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Asparagus
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Rhubarb
Borderline
Dill
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Turnip
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Parsnip
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Rutabaga
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Borage
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Snap Peas
Borderline
Cauliflower
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Cranberry
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Shallot
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Scallion
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Watercress
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Sorrel
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Calendula
BorderlineFrequently asked questions
What is USDA Hardiness Zone 1a?
Extreme subarctic cold. Only the hardiest perennials and short-season cool crops are viable in the brief summer window.
When is the last frost in Zone 1a?
The average last frost is early July, and the first frost is mid-July. That's about 14 frost-free days per year.
What grows well in Zone 1a?
2 plants grow well here, including Cabbage, Microgreens. See the full list below.
What can't you grow in Zone 1a?
93 plants are too cold or too warm for this zone — see the "won't grow" list below.
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