Start and harden off seedlings; grow early, cool-season vegetables such as spinach, leaf lettuce and radishes.
Remove the lid and start autumn crops or perennials from seed.
Extend the harvest of summer crops such as beans, beets, eggplants, onions and peppers; sow a second season of salad greens and other cool-weather crops.
Extend the harvest of autumn crops such as potatoes, winter squash, arugula, cabbage, kale and leeks; propagate shrubs and trees from cuttings, which can be left to overwinter inside the cold frame.
You might also enjoy: