@betnc--I usually start my eggplant and pepper plants about 2 weeks before my tomatoes. They seem to take a little longer to germinate and grow hardy enough to plant out.
For whoever asked about squash that could be trellised--I do delicata squash every year on a trellis. And last year, I tried Sugar Baby watermelon on a trellis and we got 1 watermelon that was awesome (had to support the fruit as it grew). Will start earlier next year....we were way to late in starting it last year.