You can have dahlias blooming in your garden in August, even here in zone 5. Choose option #1 (do it yourself), or option #2 (don’t do it yourself).
Mike’s do-it-yourself option If you followed the instructions in You Want Me to Plant My Dahlias NOW?, you are prepared for the task. You’ve got your dahlia . . . → Read More: How To Pot Up Dahlias To Get A Head Start