Home / Planting dates / Onion / New Hampshire
Onion planting and harvest datesOnion Planting Dates in New Hampshire
Usual onion planting periods in New Hampshire, shown as ranges with their source. Use them to frame a plan, then adjust for your own frost dates and soil temperature.
| Activity | Window | Source | Last verified |
|---|---|---|---|
| Start indoors | start seeds indoors 8-10 weeks before setting out | source | 2026-11-11 |
| Transplanting | transplant 4 weeks before last frost | source | 2026-11-11 |
| Item | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Start indoors | Timing in table above | |||||||||||
| Transplanting | Timing in table above | |||||||||||
What these dates mean in New Hampshire
Frost-date caveat: these are published ranges for New Hampshire. A northern or high-elevation site will run later than a southern or low one, and a cold wet spring can push planting past the window. Timing is relative to last spring frost (central NH: about Memorial Day, a conservative estimate); frost dates and local conditions vary. Check your last spring frost and soil temperature, and confirm with your county extension office.
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Other crops in New Hampshire
- Basil
- Bean
- Beet
- Broccoli
- Brussels Sprout
- Cabbage
- Carrot
- Cauliflower
- Celery
- Corn
- Cucumber
- Eggplant
- Kale
- Kohlrabi
- Leek
- Lettuce
- Melon
- Parsley
- Parsnip
- Pea
- Pepper
- Potato
- Pumpkin
- Radish
- Rutabaga
- Spinach
- Summer Squash
- Sweetpotato
- Swiss Chard
- Tomato
- Turnip
- Winter Squash
- Zucchini
Last reviewed: November 2026. Source: UNH Extension - Growing Vegetables: When to Plant Your Vegetable Garden.