Plant your head lettuce seed now, but not too deeply; lettuce seed needs light to germinate. Plant leaf lettuce in September. Make sure you keep your lettuce well watered.
Recommended varieties: Mighty Joe, Ithaca, Mavrick, Great Lakes 659.
In September look for these leaf lettuce varieties: Slobolt, Red Salad Bowl, Grand Rapids, Red Fire, Tango, Red Sails, Salad Bowl, Sunset, Simpson or Elite.
Want Romaine? Look for these varieties: Parris Island, Ideal, Green Forest and Green Towers.
Looking for butterhead or bibb lettuce? Try: Buttercrunch, Ermosa, Esmerelda, Nancy or Oak Leaf.
What about batavia types (leaf lettuce with a unique flavor)? Try: Nevada or Sierra.