Sow now › USDA zone 3 › September
What to sow in September
in USDA zone 3
1 crops can go in this month. Typical last frost zone 3: about 15 May. First autumn frost about 15 September.
Sow in September
Plant out in September
Sown earlier under cover, hardened off, and going in the ground once the last frost has passed.
Arugula
Harvest May to September
Bok Choy
Harvest June to September
Cilantro
Harvest June to September
Kale
Harvest June to October · 3 in the club sowing now
Kohlrabi
Harvest June to September
Lettuce
Harvest June to September · 3 in the club sowing now
Mustard Greens
Harvest June to September · 2 in the club sowing now
Radish
Harvest May to September · 1 in the club sowing now
Spinach
Harvest June to September · 2 in the club sowing now
Storage Potato
Harvest October
Turnip
Harvest July to September · 3 in the club sowing now
Ready to pick in September
Acorn Squash (Pumpkin)
Harvest August to November
Apple
Harvest August to February
Apricot
Harvest August to September
Arugula
Harvest May to September
Asian Pear
Harvest August to September
Basil
Harvest August to September
Beetroot
Harvest July to September · 1 in the club sowing now
Blue Potato
Harvest September
Bok Choy
Harvest June to September
Broccoli
Harvest July to September · 2 in the club sowing now
Brussels Sprouts
Harvest September to October
Bulb Onion
Harvest August to September
Butternut Squash (Pumpkin)
Harvest August to November
Cabbage
Harvest July to September
Cantaloupe
Harvest August to September
Carrot
Harvest July to September · 5 in the club sowing now
Cauliflower
Harvest July to September · 2 in the club sowing now
Celeriac
Harvest September to October
Celery
Harvest August to September
Cherry (Sour)
Harvest August to September
Cherry (Sweet)
Harvest August to September
Chives
Harvest June to September · 1 in the club sowing now
Cilantro
Harvest June to September
Collard Greens
Harvest July to September
Cucumber
Harvest July to September · 1 in the club sowing now
Edamame
Harvest August to September
Eggplant
Harvest August to September
Endive & Escarole
Harvest July to September
Fennel
Harvest August to September
Fig
Harvest August to September
Fingerling Potato
Harvest September
Giant Pumpkin (Squash)
Harvest August to November
Gourmet Potato
Harvest September
Grape (Table)
Harvest August to September
Grape (Wine)
Harvest August to September
Hot Chilli
Harvest July to October
Hubbard Squash (Pumpkin)
Harvest August to November
Jack-O'-Lantern Pumpkin (Squash)
Harvest August to November
Kale
Harvest June to October · 3 in the club sowing now
Kiwi (Fuzzy)
Harvest August to September
Kiwi (Hardy Kiwiberry)
Harvest August to September
Kohlrabi
Harvest June to September
Leek
Harvest August to October · 3 in the club sowing now
Lettuce
Harvest June to September · 3 in the club sowing now
Medium Chilli
Harvest June to September
Mild Chilli
Harvest June to September
Mulberry
Harvest August to September
Mustard Greens
Harvest June to September · 2 in the club sowing now
Napa Cabbage
Harvest August to September
Nectarine
Harvest August to September
Okra
Harvest August to September
Oregano
Harvest July to September
Ornamental Pumpkin (Squash)
Harvest August to November
Parsley
Harvest June to September
Parsnip
Harvest September to October · 1 in the club sowing now
Passionfruit
Harvest September
Pawpaw
Harvest August to September
Pea
Harvest June to September
Peach
Harvest August to September
Pear
Harvest August to February
Pie Pumpkin (Squash)
Harvest August to November
Plum (European)
Harvest August to September
Plum (Japanese)
Harvest August to September
Pomegranate
Harvest August to September
Quince
Harvest August to September
Radicchio
Harvest September to October
Radish
Harvest May to September · 1 in the club sowing now
Rosemary
Harvest July to September
Russet Baking Potato
Harvest September to October
Rutabaga
Harvest September to October
Sage
Harvest July to September
Scallion
Harvest June to September
Snap Bean
Harvest August to September
Specialty Chilli
Harvest July to October
Spinach
Harvest June to September · 2 in the club sowing now
Summer Squash (Pumpkin)
Harvest August to November
Super Hot Chilli
Harvest August to October
Sweet Bell Pepper
Harvest August to September
Sweet Corn
Harvest August to September
Sweet Potato
Harvest September
Swiss Chard
Harvest July to September
Thyme
Harvest July to September
Tomatillo
Harvest August to September
Turnip
Harvest July to September · 3 in the club sowing now
Watermelon
Harvest August to September
Yellow Potato
Harvest August to September
Zucchini (Courgette)
Harvest August to November
A nudge on the first of the monthOne email a month with what to sow in USDA zone 3, from the newsletter. Nothing else.
Remind me monthlyYour ZIP code
Type your ZIP and you'll get the page for your zone, with the typical frost dates.
Questions people ask
What can I sow in September in USDA zone 3?
1 crops go in this month in USDA zone 3: Garlic.
When is the last frost in USDA zone 3?
Typically around 15 May, with the first autumn frost about 15 September. Treat those as averages and watch the forecast; a cold spring can push them back a fortnight.
What's ready to harvest in September in USDA zone 3?
Acorn Squash (Pumpkin), Apple, Apricot, Arugula, Asian Pear, Basil, Beetroot, Blue Potato and more.
Plan the plot, track every sowing, cook the harvest
Sowing reminders and harvest forecasts for your own frost dates, the Seed Tin, Scan Centre for any label or packet, and the Potty Mouth Garden Club. Free to start.
Tony C Smith
Allotment keeper in the North East of England, the voice behind the Tony C Smith YouTube channel, and the gardener who built GrowMore CookMore. Club numbers on this page update as members log their plots. Last updated 4 September 2026.