What should I plant in January in Denver, CO?

In January 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.

What to Plant in January

Denver, CO · Zone 5b

Last frost: May 5 Frost-free days: 154

Full year calendar for Denver

The garden is dormant outdoors, but it's time to start planning and get seed orders in. Some long-season crops like peppers and onions can be started indoors this month.

January at a Glance

Indoor Transplant Direct Sow

1 5 10 15 20 25

Brussels Sprouts

Start Indoors 1

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

Brussels Sprouts

Jan 1 – Mar 8

1 per sq ft 80–110 days

January Gardening Tips

Start Brussels Sprouts indoors now to give them a head start before transplanting outside.
Check seed starting supplies — grow lights, heat mats, and fresh seed-starting mix. Order seeds early for the best selection.

Nearby Cities

Albuquerque NM · Zone 7a Salt Lake City UT · Zone 6b Omaha NE · Zone 5b Sioux Falls SD · Zone 4b Oklahoma City OK · Zone 7a Kansas City MO · Zone 6a

Related Guides

Spacing Chart

How many plants per square foot

4×8 Raised Bed Layout

Planting plans for a standard bed

Planting Calendar

When to plant for your zone

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