Zone 1 Planting Dates & Garden Guide Last frost ~Jun 1, first frost ~Aug 20

Gardening strategy for Zone 1

Zone 1 is alpine-adjacent gardening: treat the outdoor bed as a short summer rental, not a full-season lease. Count backward from August 20 first frost and ask whether each crop finishes with margin — if not, it belongs under glass or stays off the list. Prioritize a small high tunnel or even a sturdy cold frame as your primary warm-season space; use outdoor ground for peas, greens, and roots that shrug off cold nights. Indoor seed starting under LEDs in March–April is mandatory for anything that needs heat — waiting for June 1 soil warmth wastes half the usable year. Mulch heavily once soil finally warms so the brief heat pulse is not lost overnight. Skip cucurbit sprawl and long-season peppers outdoors; put limited tunnel square footage into cherry tomatoes and bush beans instead. After August 10, stop gambling on ripening fruit and shift to harvest-and-protect mode: row cover every night, dig roots early, and plant garlic for next year. Compost must be finished before freeze-up or it sits inert until late the following spring. In Zone 1 the winning mindset is infrastructure first, outdoor gambling second.

Tips for Zone 1 gardeners

• Invest tunnel or cold-frame square footage in cherry tomatoes and bush beans rather than sprawling squash outdoors.
• Back-calculate every cultivar from the August 20 first-frost stake — if maturity plus two weeks of buffer overruns, do not plant it outside.
• Finish outdoor compost turning before deep freeze; frozen piles stall and steal next June’s planting window.