Colorado planting calendar
Using Colorado’s average last spring frost of May 5 and first fall frost of October 1 — about 149 frost-free days. USDA zones 3b, 4b, 5a, 5b, 6a, 7a.
Colorado covers a very wide range of climates. Treat this as a starting point and adjust to your local frost dates — the calendar generator lets you enter them.
Download printable PDFFREEColorado planting calendar: month-by-month chart and exact dates, 2 pages, US Letter
Month by month: What to plant in February · What to plant in March · What to plant in April · What to plant in May · What to plant in June · What to plant in July · What to plant in August · What to plant in September · What to plant in October · What to plant in November · What to plant in December
| Crop | Start indoors | Transplant / sow out | Fall sowing | First harvest |
|---|---|---|---|---|
| Celeriac | Feb 10 – Feb 24 | Apr 28 – May 15 | — | Aug 13 – Sep 2 |
| Onion↗ | Feb 17 – Mar 3 | Apr 7 – Apr 24 | — | Jul 13 – Aug 12 |
| Leek | Feb 17 – Mar 3 | Apr 14 – May 1 | — | Jul 30 – Sep 18 |
| Celery | Feb 17 – Mar 3 | Apr 28 – May 15 | — | Aug 13 – Sep 22 |
| Rosemary | Feb 17 – Mar 3 | May 5 – May 22 | — | Aug 10 – Sep 9 |
| Eggplant↗ | Feb 24 – Mar 10 | May 19 – Jun 5 | — | Jul 30 – Aug 19 |
| Parsley | Feb 24 – Mar 10 | Apr 14 – May 1 | Jul 13 – Jul 30 | Jun 30 – Jul 20 |
| Shallot | Feb 24 – Mar 10 | Apr 7 – Apr 24 | Oct 5 – Oct 22 | Jul 13 – Aug 12 |
| Bell Pepper↗ | Mar 3 – Mar 17 | May 12 – May 29 | — | Jul 18 – Aug 17 |
| Chili Pepper↗ | Mar 3 – Mar 17 | May 12 – May 29 | — | Jul 28 – Aug 27 |
| Green Onion / Scallion | Mar 3 – Mar 17 | Mar 31 – Apr 17 | Jul 27 – Aug 13 | Jun 6 – Jun 26 |
| Thyme | Mar 3 – Mar 17 | Apr 28 – May 15 | — | Jul 19 – Aug 3 |
| Oregano | Mar 3 – Mar 17 | Apr 28 – May 15 | — | Jul 24 – Aug 3 |
| Mint | Mar 3 – Mar 17 | Apr 21 – May 8 | — | Jul 7 – Jul 27 |
| Sage | Mar 3 – Mar 17 | Apr 28 – May 15 | — | Jul 19 – Aug 3 |
| Tarragon | Mar 3 – Mar 17 | Apr 21 – May 8 | — | Jun 27 – Jul 27 |
| Ginger | Mar 3 – Mar 17 | May 19 – Jun 5 | — | Jan 21 – Mar 22 |
| Turmeric | Mar 3 – Mar 17 | May 19 – Jun 5 | — | Jan 21 – Mar 22 |
| Tomato↗ | Mar 10 – Mar 24 | May 5 – May 22 | — | Jul 11 – Aug 5 |
| Tomatillo | Mar 10 – Mar 24 | May 5 – May 22 | — | Jul 26 – Aug 20 |
| Ground Cherry | Mar 10 – Mar 24 | May 5 – May 22 | — | Jul 21 – Aug 10 |
| Sweet Marjoram | Mar 10 – Mar 24 | May 5 – May 22 | — | Jul 11 – Jul 31 |
| Lemon Balm | Mar 10 – Mar 24 | Apr 21 – May 8 | — | Jul 7 – Jul 27 |
| Shiso (Perilla) | Mar 10 – Mar 24 | May 5 – May 22 | — | Jul 21 – Aug 10 |
| Kale↗ | Mar 17 – Mar 31 | Apr 7 – Apr 24 | Jul 6 – Jul 23 | Jun 3 – Jun 18 |
| Broccoli↗ | Mar 17 – Mar 31 | Apr 14 – May 1 | Jun 22 – Jul 9 | Jun 20 – Jul 15 |
| Cauliflower↗ | Mar 17 – Mar 31 | Apr 14 – May 1 | Jun 22 – Jul 9 | Jun 20 – Jul 20 |
| Cabbage↗ | Mar 17 – Mar 31 | Apr 7 – Apr 24 | Jun 22 – Jul 9 | Jun 13 – Jul 23 |
| Brussels Sprouts | Mar 17 – Mar 31 | Apr 14 – May 1 | Jun 1 – Jun 18 | Jul 20 – Aug 19 |
| Okra↗ | Mar 24 – Apr 7 | May 12 – May 29 | — | Jul 8 – Jul 23 |
| Basil↗ | Mar 24 – Apr 7 | May 12 – May 29 | — | Jun 18 – Jul 18 |
| Collard Greens | Mar 24 – Apr 7 | Apr 7 – Apr 24 | Jul 13 – Jul 30 | Jun 8 – Jun 28 |
| Kohlrabi | Mar 24 – Apr 7 | Apr 7 – Apr 24 | Jul 27 – Aug 13 | May 29 – Jun 13 |
| Endive & Escarole | Mar 24 – Apr 7 | Apr 14 – May 1 | Jul 13 – Jul 30 | Jul 15 – Jul 30 |
| Radicchio | Mar 24 – Apr 7 | Apr 14 – May 1 | Jul 6 – Jul 23 | Jun 20 – Jul 30 |
| Malabar Spinach | Mar 24 – Apr 7 | May 12 – May 29 | — | Jul 13 – Jul 28 |
| Summer Savory | Mar 24 – Apr 7 | May 5 – May 22 | — | Jul 6 – Jul 21 |
| Pea↗ | — | Mar 26 – Apr 14 | Jul 13 – Jul 30 | May 25 – Jun 9 |
| Spinach↗ | — | Mar 26 – Apr 14 | Aug 3 – Aug 20 | May 7 – May 15 |
| Mache (Corn Salad) | — | Mar 26 – Apr 14 | Jul 27 – Aug 13 | May 15 – May 30 |
| Lettuce↗ | Mar 31 – Apr 14 | Apr 14 – May 1 | Jul 27 – Aug 13 | May 21 – Jun 20 |
| Swiss Chard↗ | Mar 31 – Apr 14 | Apr 14 – May 1 | Jul 13 – Jul 30 | Jun 10 – Jun 20 |
| Bok Choy / Pak Choi | Mar 31 – Apr 14 | Apr 14 – May 1 | Jul 27 – Aug 13 | May 26 – Jun 10 |
| Fennel (Bulb) | Mar 31 – Apr 14 | Apr 21 – May 8 | Jun 29 – Jul 16 | Jul 2 – Jul 27 |
| Napa Cabbage | Mar 31 – Apr 14 | Apr 14 – May 1 | Jul 13 – Jul 30 | Jun 10 – Jul 5 |
| Bitter Melon | Mar 31 – Apr 14 | May 12 – May 29 | — | Jul 13 – Aug 2 |
| Cucamelon | Mar 31 – Apr 14 | May 12 – May 29 | — | Jul 23 – Aug 2 |
| New Zealand Spinach | Mar 31 – Apr 14 | May 5 – May 22 | — | Jul 1 – Jul 21 |
| Peanut | Mar 31 – Apr 14 | May 5 – May 22 | — | Aug 20 – Oct 9 |
| Watercress | Mar 31 – Apr 14 | Apr 14 – May 1 | Aug 10 – Aug 27 | Jun 10 – Jun 20 |
| Luffa (Loofah Gourd) | Mar 31 – Apr 14 | May 12 – May 29 | — | Aug 17 – Oct 16 |
| Beet↗ | — | Apr 2 – Apr 21 | Jul 20 – Aug 6 | May 27 – Jun 16 |
| Radish↗ | — | Apr 2 – Apr 21 | Aug 17 – Sep 3 | Apr 29 – May 7 |
| Arugula↗ | — | Apr 2 – Apr 21 | Aug 10 – Aug 27 | May 7 – May 17 |
| Fava Bean (Broad Bean) | — | Apr 2 – Apr 21 | Jul 27 – Aug 13 | Jun 21 – Jul 6 |
| Tatsoi | — | Apr 2 – Apr 21 | Aug 3 – Aug 20 | May 12 – May 27 |
| Mizuna | — | Apr 2 – Apr 21 | Jul 27 – Aug 13 | May 12 – May 22 |
| Cucumber↗ | Apr 7 – Apr 21 | May 12 – May 29 | Jun 29 – Jul 16 | Jul 8 – Jul 28 |
| Zucchini / Summer Squash↗ | Apr 7 – Apr 21 | May 5 – May 22 | Jun 29 – Jul 16 | Jun 26 – Jul 11 |
| Winter Squash↗ | Apr 7 – Apr 21 | May 5 – May 22 | — | Jul 31 – Aug 30 |
| Pumpkin↗ | Apr 7 – Apr 21 | May 5 – May 22 | — | Aug 10 – Sep 9 |
| Cantaloupe / Muskmelon↗ | Apr 7 – Apr 21 | May 12 – May 29 | — | Jul 28 – Aug 17 |
| Watermelon↗ | Apr 7 – Apr 21 | May 12 – May 29 | — | Jul 28 – Aug 27 |
| Rhubarb | — | Apr 7 – Apr 24 | — | — |
| Horseradish | — | Apr 7 – Apr 24 | — | — |
| Sunflower | Apr 7 – Apr 21 | May 5 – May 22 | — | Jul 21 – Aug 20 |
| Carrot↗ | — | Apr 9 – Apr 28 | Jul 6 – Jul 23 | Jun 13 – Jul 3 |
| Turnip | — | Apr 9 – Apr 28 | Aug 3 – Aug 20 | May 24 – Jun 13 |
| Mustard Greens | — | Apr 9 – Apr 28 | Aug 3 – Aug 20 | May 14 – May 29 |
| Rapini (Broccoli Raab) | — | Apr 9 – Apr 28 | Jul 27 – Aug 13 | May 24 – Jun 13 |
| Chervil | — | Apr 9 – Apr 28 | Aug 3 – Aug 20 | May 24 – Jun 13 |
| Chives | — | Apr 14 – May 1 | — | — |
| Asparagus | — | Apr 14 – May 1 | — | — |
| Sorrel | — | Apr 14 – May 1 | — | — |
| Potato↗ | — | Apr 16 – May 5 | — | Jun 30 – Aug 19 |
| Cilantro / Coriander | — | Apr 16 – May 5 | Jul 20 – Aug 6 | Jun 5 – Jun 30 |
| Salsify | — | Apr 16 – May 5 | — | Aug 9 – Sep 18 |
| Borage | — | Apr 16 – May 5 | Jul 27 – Aug 13 | Jun 15 – Jul 5 |
| Globe Artichoke | — | Apr 21 – May 8 | — | — |
| Parsnip | — | Apr 23 – May 12 | — | Aug 6 – Sep 5 |
| Dill | — | Apr 30 – May 19 | Jul 27 – Aug 13 | Jun 14 – Jul 4 |
| Bush Bean↗ | — | May 7 – May 26 | Jul 6 – Jul 23 | Jul 1 – Jul 11 |
| Pole Bean↗ | — | May 7 – May 26 | — | Jul 11 – Jul 21 |
| Sweet Corn↗ | — | May 7 – May 26 | — | Jul 11 – Aug 20 |
| Edamame (Soybean) | — | May 7 – May 26 | — | Jul 26 – Aug 20 |
| Amaranth (Leaf) | — | May 7 – May 26 | — | Jun 11 – Jul 1 |
| Lima Bean | — | May 14 – Jun 2 | — | Jul 23 – Aug 22 |
| Southern Pea (Cowpea) | — | May 14 – Jun 2 | — | Jul 18 – Aug 17 |
| Chayote | — | May 14 – Jun 2 | — | Sep 16 – Oct 16 |
| Sweet Potato | — | May 19 – Jun 5 | — | Aug 24 – Sep 23 |
| Rutabaga | — | — | Jun 15 – Jul 2 | — |
| Garlic↗ | — | — | Oct 12 – Oct 29 | — |
Windows are ~1–2 week bands around each date. Frost dates are a statewide average from NOAA/NCEI normals; your town may differ by two weeks or more. Calendar year 2026.