Answer: Grass seed will germinate and grow as long as the soil temperature is above 40F. It may be a little late in the year for you to overseed the bare spots but since grass seed is inexpensive, I'd go ahead and try. If it doesn't take, you can always reseed in the spring. Tulips can be planted now and there are a few cool season annuals you can add to your yard - ornamental kale or cabbage, primroses, pansies, for instance. Aside from the above, you should wait until spring to plant.
Enjoy your new landscape!
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