What should I plant in December in Denver, CO?

In December in Denver, CO (zone 5b), you can plant Brussels Sprouts, and more. These dates are based on local climate data for your area.

When do I plant Brussels Sprouts in Denver, CO?

In Denver, CO (zone 5b), Brussels Sprouts: start seeds indoors Jan 1 – Mar 8 and Dec 17 – Dec 31, transplant outdoors Apr 24 – Jul 16.

Denver, CO · Zone 5b

Last frost: May 5 Frost-free days: 154

The garden rests under snow or mulch. This is planning season — review what worked, order seeds, and sketch out next year's bed layouts.

Indoor Transplant Direct Sow

1 5 10 15 20 25

Brussels Sprouts

Start these seeds indoors under grow lights or on a sunny windowsill.

Brussels Sprouts

Dec 17–31

1 per sq ft 80–110 days

Start Brussels Sprouts indoors now to give them a head start before transplanting outside.
Get a soil test now — results come back fast in the off-season and you can amend before spring.

How many plants per square foot

Planting plans for a standard bed

When to plant for your zone

Add these crops to your garden plan and get personalized planting reminders for Zone 5b.