What to Plant in December in Colorado
Your December planting guide for Colorado (USDA Zones 3–7, typically Zone 5). We've broken out activities by zone — jump to yours below.
Growing season varies across Zones 3–7 — 120–210 days. Pick the zone that matches your part of the state.
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57
Start Indoors
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Transplant Outdoors
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Direct Sow
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75
Harvest
Colorado · Zones 3–7
Zone 5 December guideZone 5 — December in Colorado★ Most of CO
69 varieties active · Last frost April 30 · 155-day season
Alfalfa Microgreens
Microgreens · 6-10d
Amaranth Microgreens
Microgreens · 50d
Amaranth, Glitter Mix
Microgreens · 16-25d
Arugula Microgreens
Microgreens · 10-15d
Basil Microgreens
Microgreens · 74d
Basil, Lemon
Microgreens · 16-25d
Beet Microgreens
Microgreens · 55d
Broccoli Microgreens
Microgreens · 7-10d
Zone 4 — December in Colorado
69 varieties active · Last frost May 10 · 135-day season
Alfalfa Microgreens
Microgreens · 6-10d
Amaranth Microgreens
Microgreens · 50d
Amaranth, Glitter Mix
Microgreens · 16-25d
Arugula Microgreens
Microgreens · 10-15d
Basil Microgreens
Microgreens · 74d
Basil, Lemon
Microgreens · 16-25d
Beet Microgreens
Microgreens · 55d
Broccoli Microgreens
Microgreens · 7-10d
Zone 6 — December in Colorado
68 varieties active · Last frost April 15 · 180-day season
Alfalfa Microgreens
Microgreens · 6-10d
Amaranth Microgreens
Microgreens · 50d
Amaranth, Glitter Mix
Microgreens · 16-25d
Arugula Microgreens
Microgreens · 10-15d
Basil Microgreens
Microgreens · 74d
Basil, Lemon
Microgreens · 16-25d
Beet Microgreens
Microgreens · 55d
Broccoli Microgreens
Microgreens · 7-10d
Zone 3 — December in Colorado
72 varieties active · Last frost May 15 · 120-day season
Alfalfa Microgreens
Microgreens · 6-10d
Amaranth Microgreens
Microgreens · 50d
Amaranth, Glitter Mix
Microgreens · 16-25d
Arugula Microgreens
Microgreens · 10-15d
Basil Microgreens
Microgreens · 74d
Basil, Lemon
Microgreens · 16-25d
Beet Microgreens
Microgreens · 55d
Bottle or Birdhouse
Squash & Cucumbers · 125d
Zone 7 — December in Colorado
68 varieties active · Last frost April 1 · 210-day season
Alfalfa Microgreens
Microgreens · 6-10d
Amaranth Microgreens
Microgreens · 50d
Amaranth, Glitter Mix
Microgreens · 16-25d
Arugula Microgreens
Microgreens · 10-15d
Basil Microgreens
Microgreens · 74d
Basil, Lemon
Microgreens · 16-25d
Beet Microgreens
Microgreens · 55d
Broccoli Microgreens
Microgreens · 7-10d