Lettuce will start bolting when it gets hot, but you could follow them with a different type of leafy green like chard, bok choi, or kale that’s more heat tolerant. (Bok choi will eventually bolt too, but I generally harvest the whole plant before it gets to that point.)
I've found bok choy to be far more bolt happy than lettuce, so I've only tried growing bok choy in early spring. Lettuce starts bolting maybe around 80F.