Zones 1 and 2 cover northern Alaska, the Yukon, and the northernmost reaches of Canada — average minimum winter temperatures reach -50°F to -30°F and the frost-free season lasts just 60-90 days. People grow food here every year, but it requires precise planning, the right varieties, and season extension tools. The last frost typically falls in late May or early June; the first fall frost arrives by mid-August. Record your own frost dates for at least three years before relying on regional averages.
What to Grow
Focus on fast-maturing, cold-hardy crops: radishes (Cherry Belle, 22 days), spinach (Space or Tyee, 40-45 days), lettuce (Black-Seeded Simpson, 45 days), kale (Siberian), arugula (40 days), turnips (Purple Top, 45 days), beets (Early Wonder, 50 days), peas (Alaska Pea, 56 days), and carrots (Napoli, 58 days). Potatoes — Yukon Gold and Red Norland — mature in 70 days and excel in short seasons. For warm-season crops, use sub-arctic tomato varieties like Siberia (57 days) or Sub-Arctic Plenty (45 days) with walls of water and row cover.
Start Indoors Early
Starting transplants 8-10 weeks before last frost is not optional in zones 1-2 — it is how you grow anything beyond cold-hardy greens. Use full-spectrum LED grow lights (14-16 hours daily). Start tomatoes 10 weeks out. Harden off for at least 10 days — cold-acclimated transplants survive late frosts that kill unhardened seedlings.
Season Extension and Soil
Cold frames extend your season 4-6 weeks on each end. Walls of water allow tomatoes out 4-6 weeks early and protect to 16°F. N-50 row cover over low tunnels adds 4-6°F of frost protection. An unheated 8x12 hoop house extends the season by 8-10 weeks. For soil: add 2-3 inches of compost annually. Raised beds on south-facing slopes run 5-8°F warmer than flat in-ground beds — effectively a full zone improvement.
Frequently Asked Questions
- Can I grow tomatoes in zone 1 or 2?
- Yes with effort — use sub-arctic varieties, start 10 weeks indoors, and use walls of water. Many zone 1-2 gardeners grow tomatoes in an unheated hoop house for reliable results.
- How do I deal with permafrost?
- Raised beds are your only option — 18-24 inches of growing medium above the frost line. Never till permafrost; disturbing it causes subsidence and drainage problems.
- What row cover weight should I use?
- N-50 or heavier for frost protection; N-30 for wind and light frost to 28°F. Layer both for extreme events.
- What crops should I avoid?
- Corn, melons, sweet potatoes, and long-season peppers are not practical outdoors without a heated greenhouse.