Jake, I am from NWPA and do both handrill and bowdrill, My favorites are weed stalks, here are a few we have in Pa.
Horseweed
Mullein
Mugwort
Yucca
Here are some actual wood spindles that I have used
Quaken Aspen
Yellow Poplar ( not my favorite but will work)
white pine
Pawpaw
Hearth boards that have worked .
whitepine
cedar
pawpaw
quaken aspen
yellow poplar
cotton wood
A long as it is dry and soft enough to mark with your finger nail there lots of other and that is part of the fun experimenting with all kinds of woods and weeds, Rose of Sharon off of the wife's lawn shrubs. Hope this helps ya some. Bob