I put mine down 2 weeks ago along with a little generic fertilizer that was something like 28-2-11 I think to add a little more phosphorus and potash. This morning before the rain would have been perfect probably if you had not already fertilized. My lawn will probably be ready to mow sometime next week as much as it has greened up since the last rain we had.
I checked the temps first part of the week and they were in the low 40's so they haven't been 50 for long. You could put the crabgrass down now because it won't be long now till the seeds start to germinate and/or the roots wake up on the existing crabgrass. Grass will start turning green and grow pretty fast now so fertilize now would be good too.
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