It's time to start vegetable seeds indoors, especially if you want to transplant cool season veggies like broccoli, Brussels sprouts, cauliflower and cabbage outside in a few weeks. Read my latest column on seeds and reading a seed packet first - Denver Post March 7, 2015 Punch List. Then check the chart below for windows to sow indoors or direct seed outside. Some cool-season seeds like lettuce, spinach, and arugula are just better directly sown in the ground when the weather and soil conditions are right (March through early May). They are such quick growers there's no need to start them by seed indoors. If you have cold frames or similar to get started earlier, then you know what to do (don't forget to send me photos of your early lettuces please). It's much too early to plant warm-season crops outside, but it's time to start peppers and eggplant by seed indoors, they can take up to 8 weeks to fully grow into transplant size. I'll post a chart for flower seeds shortly, so please check back. Vegetable Planting Calendar for the Colorado Front Range
Add at least 2 weeks for higher altitudes
For super earlier spring planting (using Tunnels, Cloches, Cold Frames), move up all dates accordingly
CROP – COOL SEASON | DAYS TO MATURITY | START SEEDS INDOORS | PLANT SEEDS IN THE GROUND | PLANT TRANSPLANTS OUTSIDE | Arugula | 30 |
| April 15-June 1 |
| Asparagus | Perennial |
|
| Plant root crowns April 15 to May 15 | Beets | 60-65 |
| May 1-May 15 |
| Broccoli | 70 | March 1-Mar15 |
| April 1-May 15 | Brussels Sprouts | 80-95 | March 1-Mar15 |
| April 1-May 15 | Cabbage | 60-70 | March 1-Mar15 |
| April 1-May 15 | Carrots | 55-75 |
| May 1-May 15 |
| Cauliflower | 50-55 | March 1-Mar15 |
| April 1-May 15 | Cilantro | 55-65 | March 1-Mar30 | May 1- May 15 | May 1 - May 15 | Chard-Swiss | 50 |
| April 15-July 15 |
| Celery | 85-110 |
|
| Fall planted best | Chinese (Napa) Cabbage | 48-55 | April 15-April30 |
| May 15-June 1 | Chives Onion | Perennial |
|
| May 15-Sept. 15 | Chives Garlic | Perennial |
|
| May 15-Sept. 15 | Collards | 50-55 | April 15-May15 |
|
| Garlic |
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| Best planted in Fall | Horseradish | Perennial |
|
| May 15-June 15 | Kale, Mustard Greens | 50-55 |
| April 15-May15 |
| Kohlrabi | 55 |
| April 15-May15 |
| Lettuce Leaf | 40-45 |
| April 15-May15 |
| Lettuce Head | 70-80 |
| April 15-May15 |
| Onion Bulb | 100 |
| April 15-May15 |
| Onion Bunching | 60-80 |
| April 15-May15 |
| Parsley | 75 | March 1-Mar30 | May 1-May 15 | May 1 – May 15 | Parsnips | 85-120 |
| April 15-May15 |
| Peas – shell and snap | 50-65 |
| April 15-May15 |
| Peas Edible Podded - snow | 60 |
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| Potato Tubers | 80-120 |
| April 15-May15 |
| “New” Potatoes | 50-60 days |
| April 15-May15 |
| Radishes | 20-30 |
| April 15-May15 |
| Rhubarb | Perennial |
|
| May 1 –June 15 | Rutabaga | 90-95 |
| Early August |
| Spinach | 30-50 |
| April 15-May15 |
| Turnip | 40-75 |
| April 15-May15 |
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| CROP – WARM
SEASON | DAYS TO MATURITY | START SEEDS INDOORS | PLANT SEEDS IN THE GROUND | PLANT TRANSPLANTS OUTSIDE | Basil | 60-85 | April 15-May 15 | June 1-July 15 | June 1 – August 15 | Beans, Bush | 45-50 |
| May20-July 15 |
| Beans, Pole | 60-65 |
| May 20-June 30 |
| Corn, Sweet | 65-80 |
| May 20-June 15 |
| Cucumber Slicing | 48-72 |
| May 20-June 15 |
| Cucumber Pickling | 58-58 |
| May 20-July 1 |
| Eggplant | 60-80 | March 15- April 10 |
| May 20-June 10 | Cantaloupe | 85-120 | April 15-May1 | May 20-June 10 | May 20-June 10 | Okra | 55-65 | April 15-20 | June 10-July 15 | June 10-July 15 | New Zealand Spinach | 50-60 |
| May 20-July 15 |
| Pepper | 70-80 | March 1- April 10 |
| May 20-June 10 | Pumpkin | 95-110 | April 15-May 1 | May 20-June 5 | May 20-June 5 | Squash Summer | 55-65 | April 15-May 1 | May 20-July 15 | May 20-June 10 | Squash Winter | 55-105 | April 15-May 1 | May 20-June 10 | May 20-June 10 | Tomato | 60-85 | March 15- April 10 |
| May 20-June 20 | Tomatillos | 75-100 | March 15- April 10 |
| May 20-June 10 | Watermelon | 75-100 | April 5-15 |
| May 20-June 10 | |
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