The best season for vegetables depends on what you want to grow. Cool season crops like lettuce and broccoli thrive in spring and fall when temps stay between 55-75°F (13-24°C). Warm season crops like tomatoes and peppers need summer heat with nights above 60°F (16°C) to produce fruit.
I used to think summer was the only real growing season. Then I started gardening in spring and fall too. My spring lettuce beat anything I grew in summer heat. Fall broccoli tasted sweeter than spring. Learning the optimal vegetable growing season for each crop changed my results.
I tested this over several years with the same varieties in different seasons. Lettuce planted in April produced for two months before bolting. The same seeds planted in June bolted in two weeks. Fall plantings in September gave me harvests right up until Christmas with row cover protection.
Cool season vegetables grow best in the milder temps of spring and fall. These plants stop producing or turn bitter when heat arrives. Spinach bolts at 80°F (27°C) and broccoli forms tiny buttons. Root crops develop woody cores in hot soil. You have to time these plantings to avoid summer.
Warm season vegetables need heat to set fruit and ripen properly. Tomatoes drop their flowers when nights stay below 55°F (13°C). Peppers turn yellow and stunted in cool weather. Squash and cucumbers rot in cold wet soil. These crops only succeed during the warm months of summer.
Many gardeners skip fall planting but it works great. Pest pressure drops after the first frost kills most insects. Disease pressure falls too since fungal spores die in cold air. Frost converts starches to sugars making fall harvests taste sweeter than spring ones.
When to grow vegetables follows a simple pattern once you know it. Start cool season crops 4-6 weeks before your last spring frost. Plant warm season crops 1-2 weeks after the last frost when soil warms up. Start fall cool season crops 8-12 weeks before your first fall frost to give them time to mature.
Plan your garden to use all three growing windows for maximum production. Cool season crops fill spring beds from March to May. Warm season crops take over from June through August. Cool season crops return in September and produce until hard freezes stop growth in November or December.
This three season approach keeps fresh produce on your table most of the year. You harvest something from the garden for nine months in most zones instead of just the three months of summer. Match each crop to its best season and your garden rewards you with better yields and flavors.
Read the full article: Cool Season Vegetables: Complete Growing Guide
