Gaps in the lawn - When is the best time to overseed?

It could be that in some places there is no seed left, as it often gets washed away in the rain when there is heavy rainfall. As long as it is still there, I would wait another 3 days; after that, nothing much will happen. Right, I would also avoid stepping on the area if possible. Freshly germinated grass is very sensitive. I just didn’t think that there are also larger lawns than mine, which I could always reseed by hand from the edges ;) But I would wait with the first mowing until the last seed has germinated, plus 3 days. Then water and reseed the last gaps.

Forget it, nothing works from the edge. The strip behind the house is 3-4 m wide and 25 m long ;-D

Online I found something that says the sports turf should be about 7.5 cm high before the first mowing. I'm still waiting for that, maybe something will still happen. Then we'll see how much weed flies in and whether we dare to wait until autumn or start overseeding right away.

Spring. Currently, the lawn is dead everywhere.

Spring. Currently the grass is dead everywhere

Correct: Everywhere where no spraying takes place.

So mine is lush green and lively, of course you have to run 1m³ per day. The day before yesterday I fertilized again, because at these temperatures of course metabolism also increases.

I need a photo to make a diagnosis.

Correction: Everywhere where there is no blasting.

So mine is deep green and full of life, of course you have to run 1m³ per day. The day before yesterday I fertilized again, because at these temperatures there is naturally more metabolism.

Yes, we missed that. All the neighbors too ;) if you fertilize then 1.5-2. Otherwise it burns from the inside?