And maybe the third week for tomatoes. Keep an eye on that forecast for any return to temperatures around freezing. When you overseed your fescue lawn, don't skimp on the grass seed. If you do, you'll have weeds that you will find difficult if not impossible to eradicate. You can't really get rid of orchardgrass.
Annual bluegrass is another particularly pernicious weed seed.
It may cost more initially, but the cost will be low in the long run. And get your overseeding done within the next week. These weeds can be pulled. You can also use a broadleaf herbicide such as 2,4-D, or a nonselective one such as Roundup if the grasses are fully dormant. If the grass has started to turn green near the crown of the plant on the ground, don't use the chemical.