The is the first year I've worried about weeds in the lawn around the house since I was glad to have anything green after I beat back the encroaching forest.
The first week of March is a good time to apply a pre-emergent herbicide with fertilizer. Here's a tip: Scotts is a good brand, but something like Lesco has the same makeup and is about $20 a bag cheaper. If you wait too much longer, a pre-emergent won't do any good. It must get into the ground before the weeds start growing. In about six weeks I'll have to apply another round of herbicide, this time without the fertilizer.
I also took the opportunity to spread 10-10-10 on the grass I planted in the fall on the lower level. I always mix 10-10-10 with a little agricultural lime. I spread it fairly lightly because this is the grass I don't want to spend a lot of time mowing.
We're supposed to have several days of rain. If so, good timing.