Growing Brussels Sprouts in Zone 1a

Zone 1a has harsh winters and a short growing season. Start Brussels Sprouts early indoors to maximize your harvest window. Last frost: May 25. First frost: Aug 28.

Season Too Short

Brussels Sprouts needs 100 days to harvest, but Zone 1a has only a 95-day growing season. Consider short-season varieties or season extension techniques (cold frames, row covers).

Zone1a

Last FrostMay 25

First FrostAug 28

Season Length95 days

Days to Harvest100

SunFull Sun

Frost ToleranceModerate

Spacing24/sqft

When to Plant Brussels Sprouts in Zone 1a

Start Seeds Indoors: Apr 13

Start Brussels Sprouts seeds indoors around Apr 13 (6 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 5–10 days.

Transplant Outdoors: May 11

Transplant Brussels Sprouts seedlings outdoors after May 11. Wait until soil temperature reaches 50°F. Space plants at 24/sqft. Harden off plants for a week before moving outside.

Harvest: Aug 9

First harvest approximately Aug 9 (~90 days from transplant). Continue harvesting until first frost (Aug 28).

Fall Planting: May 8

For a fall harvest, plant Brussels Sprouts around May 8 (16 weeks before first frost).

Companion Planting

✅ Thyme✅ Nasturtiums✅ Onions✅ Garlic

❌ Beans❌ Strawberries

Brussels Sprouts in Other Zones

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

Frequently Asked Questions

When should I plant Brussels Sprouts in Zone 1a?

Start Brussels Sprouts seeds indoors around Apr 13. Transplant outdoors after May 11. Expect first harvest around Aug 9.

What is the last frost date for Zone 1a?

The average last spring frost date for Zone 1a is May 25. The first fall frost averages Aug 28, giving a 95-day growing season.

Can I grow Brussels Sprouts in Zone 1a?

Zone 1a has a 95-day growing season, which may be too short for Brussels Sprouts (100 days needed). Consider short-season varieties or season extension techniques.

What is the best month to plant Brussels Sprouts in Zone 1a?

The best time to start Brussels Sprouts in Zone 1a is Apr. Begin seeds indoors around Apr 13, then transplant outdoors after the last frost date of May 25.

What companion plants grow well with Brussels Sprouts?

Good companion plants for Brussels Sprouts include Thyme, Nasturtiums, Onions, Garlic. Avoid planting Brussels Sprouts near Beans, Strawberries.

How long does Brussels Sprouts take to harvest?

Brussels Sprouts takes approximately 100 days from planting to harvest. In Zone 1a, expect your first harvest around Aug 9.

Plan Your Brussels Sprouts Garden

Track Brussels Sprouts from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.

Start Free Brussels Sprouts Growing Guide