Turf Grass reseeding
We renovated our lawn in mid-October ( removed the old, brought in mulch and gravel, tilled, limed, reseeded and covered with dry grass mulch) and most of the new grass is coming up. There are a few bare patches as the heavy rains may have washed some of the seed away. Is it too late to sow some extra seed in the bare patch areas or should we wait until next spring.
Clackamas County Oregon
You've done great work renovating your lawn. It should be beautiful next spring. For the bare patches, the optimal temperature for grass seed germination is between 60 and 85 degrees. You could try overseeding now - you'll only lose the cost of the seed, but next spring is a much better bet. Fall (mid August to mid September) is a great time to plant grass. However, early May to June is also a good time to plant turf. Temperatures are warming and we are still getting some rains. You'll still have to water frequently at first, but humidity is in a good range, so the seeds should stay moist. Later than mid June it's difficult to keep grass moist enough to ensure good germination. This article, Practical Lawn Establishment and Renovation https://catalog.extension.oregonstate.edu/sites/catalog/files/project/pdf/ec1550.pdf has excellent information on lawn renovation.