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When to Plant Vegetables in Denver

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By Carl Wilson, horticulture agent, Colorado State University Cooperative Extension, Denver

By March, many vegetable gardeners have already planted the most hardy, cool-season vegetables, including peas, onions, lettuce, radish and spinach, but April is not too late. With peas, you reap a 50 percent higher yield by planting April 1 as opposed to delaying until May 1.

Semi-hardy vegetables can be sown in late April. They include beets, carrots, potatoes, Swiss chard and cauliflower.

Delay planting warm-season vegetables until May. By midmonth you can plant beans, corn, cucumbers and summer squash. For those intolerant of the lightest frost, don't plant until the end of May, when the frost danger is well past. This very tender group includes tomatoes, eggplant, peppers, winter squash, cantaloupe, watermelons and pumpkins.

Photo: Judy Sedbrook

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Date last revised: 01/05/2010