🥦 When to Plant Brussels Sprouts

When should I plant brussels sprouts?

Plant brussels sprouts outdoors 8 weeks before last frost. For a head start, start seeds indoors 12 weeks before your area's last frost date. Transplants can go out 6 weeks before last frost.

Is brussels sprouts frost sensitive?

Brussels Sprouts can tolerate light frost, surviving temperatures as low as 28°F. This makes it a great candidate for early spring or fall planting when other crops can't go out yet.

What temperature does brussels sprouts need?

Brussels Sprouts grows best between 45°F and 65°F. It can survive down to 28°F, but growth slows significantly below 45°F. It prefers cool weather and may bolt or stop producing if summer heat arrives early.

How long does brussels sprouts take to grow?

Brussels Sprouts typically takes 90–120 days from transplant (or direct sow) to first harvest. This is a long-season crop — start seeds early enough to ensure harvest before your area's first fall frost.

Should I start brussels sprouts seeds indoors?

Yes — start brussels sprouts seeds indoors 12 weeks before your area's last expected frost date. This gives seedlings time to develop strong roots before outdoor conditions are ready.

Is it too cold to plant brussels sprouts?

It is too cold to plant Brussels Sprouts outdoors when nighttime temperatures are falling below 28°F. While Brussels Sprouts can tolerate temperatures as low as 28°F, growth will be slow until nights consistently exceed 45°F. Use CanIPlant to check your local 7-day forecast and get a real-time answer for your ZIP code.

Is it too hot to plant brussels sprouts?

Brussels Sprouts starts to struggle when temperatures climb above 65°F. As a cool-season crop, Brussels Sprouts is especially heat-sensitive — high temperatures cause bolting, bitter flavor, or complete crop failure. Avoid planting in the peak of summer and opt for spring or fall instead. CanIPlant checks your local forecast highs to flag this automatically.

Any tips for growing brussels sprouts?

Long season. Best harvested after first frost — sweetens flavor.