Certified GKH Gardening Expert
If you mean growing transplants, it's not too late. If you mean growing plants from seeds, it depends on the growing season in your area. On the seed packet, it tells how long it takes for the plant to mature, 90 days for example. You must be sure the plant has that much time left before the first frost. Of course, if you are growing vegetable transplants, you also need to be sure there is time for the plant to mature before the first frost.