Growing onions in zone 2
Bulbing is triggered by day length: long-day varieties for the North, short-day for the South, intermediate in between — the wrong type simply won’t bulb. Sets are easiest; transplants give bigger bulbs.
Zone 2 covers central Alaska (Fairbanks area), highest Rockies — short but intense season with very long summer days — fast, hardy crops shine. Zone dates are medians: frost timing varies within a zone with elevation and terrain, so treat these windows as a solid default and refine them with your own city’s dates below.
Make it local
These windows use zone 2's typical frost dates (last frost ~May 30, first frost ~Sep 8). For windows computed from your frost dates, run the ZIP code frost lookup and open the planting calendar — it remembers your city. The seed starting scheduler turns the whole seed rack into one printable, date-sorted list.
Frequently asked questions
When do I plant onions in zone 2?
Transplant Apr 18 – May 2, counted from zone 2's typical last frost around May 30. As a hardy crop it tolerates the light frosts on either side of that window.
When should I start seeds indoors for onions in zone 2?
Sow indoors Mar 21 – Apr 4 — that's 10 to 8 weeks before the typical May 30 last frost, giving sturdy transplants exactly when the garden is ready for them.
Can I direct sow onions in zone 2?
Yes — direct sow May 2 – May 16. Transplants buy a head start, but direct-sown plants catch up quickly once soil warms.