I've always had better results doing a new seeding in the Fall than in the Spring.
In the Spring, if you have a greenfield to plant it's always better to start as soon as the frost stops - like April.
I'm not sure hydro seeding really carries any incremental benefit other than ease of application - you can basically get the same ingredients at your local home and garden place.
So I'm biased towards using a drop spreader.
Prep the soil by thoroughly raking (get rocks and stuff out).
Water, and add nutrients as necessary (lime, starter fertilizer).
Then drop seed with a spreader (rotary for larger areas), and work into the soil with a rake. For faster results, don't be stingy with the seed but don't drop so much you'll get crowded out areas.
You can also get the green nutrient enriched ground-up newspaper mulch to cover up the lawn when it gets wet, which is important when it gets hot.
Drawback of a spring seeding is that you can't use crabgrass pre-emergent (it will prevent grass seedlings from growing), so don't use any weed inhibitors on a new project.
You might still have some time - you just have to keep the soil moist.
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