One thing you might could be may be able to do Sec, is start the seeds indoors, then when they sprout, take them at a fixed up place outside, even if it's a "redneck greenhouse", or just 2 x 4's nailed together with white plastic, with a shelf in it, and you can make the whole thing movable. Have a thermometer or 3 in it, and if it gets less than 45 or 50 degrees in it at night, move the flats inside the house at night. I double the flats up because they make them so flimsy. The little temporary greenhouse for a few flats can then be stored for next year or taken apart and make another little one like it the next year. Or if your days are nice, no makeshift greenhouse is needed. Trick is to do it soon as they sprout so they sprout hardened off already. Depends of course on the kind of plant.
For my beans, here this year i'm lucky. They are outside in the sun during the days, and since it's still like 49 or 50 at night, I bring them in at night. They'd actually be ok if I left them out, just those slightly cool nights for beans would slow them down, oh, maybe. I've been taking them outside since about the time about half of them started sprouting.
Saves the hassle of lights, plus i'm off grid, so I make do with as little electricity as possible. I did use a 17 watt heat pad though to sprout them.