Boston, Massachusetts: freeze dates & growing season
Three different things get called “Boston” here, so this page is explicit about all three: the metro label (Boston), the anchor geography (Census ZCTA 02108, a downtown ZIP-code area), and the climate record (the NOAA station below). Windows are calculated from the station — not from your street address.
Climate basis: NOAA station Boston Logan INTL AP, MA (USW00014739), 3 mi (5 km) from the ZCTA 02108 centroid, elevation 12 ft, on the 1991–2020 climate normals.Last spring freezeApril 41-in-10 after Apr 17
First fall freezeNovember 91-in-10 before Oct 29
Frost-free season≈ 218 daysmedian at 32°F
Hard freeze, 28°Mar 28 – Nov 21kills even hardy greens
USDA zone7a0 to 5°F winter low — not frost timing
The year
- indoors under lights
- in the garden
- frost-free season
- 1-in-10 years still freeze to Apr 17
What that means in practice
- Tomatoes: plant April 11 – April 25
- Peas: plant February 21 – March 7
- Garlic: plant cloves November 16 – November 23
All 79 crops in Boston
- Arugula
- Asparagus
- Basil
- Beets
- Bok choy
- Borage
- Broccoli
- Brussels sprouts
- Bulb Fennel
- Cabbage
- Calendula
- Carrots
- Cauliflower
- Celeriac
- Celery
- Celosia
- Swiss chard
- Chinese Cabbage (Napa)
- Chives
- Cilantro
- Collards
- Cosmos
- Cucumbers
- Dill
- Eggplant
- Endive and Escarole
- Garden Cress
- Garlic
- Green beans
- Hairy Vetch
- Horseradish
- Kale
- Kohlrabi
- Lavender
- Leeks
- Lemon Balm
- Lettuce
- Lima Bean
- Marigold
- Melons & cantaloupe
- Morning glory
- Mustard greens
- Nasturtium
- Okra
- Onions
- Parsley
- Parsnips
- Peanut
- Peas
- Peppers
- Potatoes
- Pumpkins
- Radicchio
- Radishes
- Rhubarb
- Rosemary
- Rutabaga
- Sage
- Salsify
- Scallions (Green Onions)
- Snapdragon
- Southern Pea
- Spinach
- Strawberries
- Summer Savory
- Summer squash & zucchini
- Sunflower
- Sweet Alyssum
- Sweet corn
- Sweet Marjoram
- Sweet potatoes
- Tarragon
- Thyme
- Tomatoes
- Turnips
- Watermelon
- Winter Rye
- Winter squash
- Zinnia
These windows describe typical years (1991–2020 climate normals), not this year's forecast. Freezes happen outside them — especially in frost pockets, valleys, and urban edges. Watch the forecast before committing tender plants.
Check a specific ZIP instead
Metro climates vary — elevation, water, and urban heat shift freeze dates by days to weeks. Look up your exact ZIP:
Nearby reviewed metros
Providence, RI · Manchester, NH · Hartford, CT · Portland, ME · Burlington, VT