USDA zone 4b planting guide
Zone 4b means an average annual winter low of -25°F to -20°F. That coldest-temperature band describes winter cold tolerance. Frost dates and growing-season length come separately from NOAA climate normals.
A typical location in zone 4b sees its last spring frost around May 8 and its first fall frost around October 1. Pick a crop for its zone 4b planting dates, or get dates for your exact ZIP.
Zone 4b by month
Open the months with enough source-backed tasks for a useful zone 4b checklist.
The zone 4b planting year
When to start, transplant, sow, and harvest each crop in a typical zone 4blocation. Tap a crop for its full guide.
Augustthis month
Active now· 15
- CarrotHarvestJune 26 – August 2
- LettuceFall plantingJuly 2 – August 6
- FennelHarvestJuly 7 – August 6
- Sweet CornHarvestJuly 7 – August 20
- KohlrabiFall plantingJuly 9 – August 6
- TomatilloHarvestJuly 14 – August 5
- PumpkinHarvestJuly 17 – September 19
- RomanescoHarvestJuly 22 – August 16
- CabbageFall plantingJuly 23 – August 27
- CauliflowerFall plantingJuly 23 – August 27
- SpinachFall plantingJuly 23 – August 27
- ParsnipHarvestJuly 26 – August 22
- KaleFall plantingJuly 30 – September 3
- RutabagaFall plantingJuly 30 – August 6
- WatermelonHarvestAugust 1 – August 20
Browse all 68 zone 4b crop guidesComplete directory
- Ageratum
- Annual Salvia (Scarlet Sage)
- Bachelors Button
- Basil
- Beet
- Bitter Melon
- Black-Eyed Susan
- Bok Choy
- Borage
- Broccoli
- Brussels Sprouts
- Cabbage
- Cantaloupe
- Carrot
- Cauliflower
- Celeriac
- Collards
- Cosmos
- Cucamelon
- Cucumber
- Dahlia
- Dill
- Eggplant
- Fennel
- Forget-me-not
- French Sorrel
- French Tarragon
- Garlic
- German Chamomile
- Globe Amaranth
- Globe Artichoke
- Green Bean (Snap Bean)
- Ground Cherry
- Impatiens
- Kale
- Kohlrabi
- Lettuce
- Luffa Gourd
- Malabar Spinach
- Marigold
- Mexican Sunflower
- Moonflower
- Mustard Greens
- Nasturtium
- New Zealand Spinach
- Parsley
- Parsnip
- Pepper
- Petunia
- Potato
- Pumpkin
- Radish
- Rhubarb
- Romanesco
- Rutabaga
- Spinach
- Stock
- Sunflower
- Sweet Alyssum
- Sweet Corn
- Sweet Marjoram
- Swiss Chard
- Tomatillo
- Tomato
- Watermelon
- Wax Begonia
- Winter Squash
- Zucchini
Not sure which zone you are in?
Browsing zone 4b but not sure it's yours? Enter your ZIP and we will confirm your USDA zone and pull your nearest station's frost dates.
USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service / Oregon State University PRISM Group. NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020. Zone dates are medians across the zone; your town varies.