Hi Jim,
I plan on doing the same thing for the month of May. I started threads on the Yahoo Citabria forum, the AOPA forum, and on the Pilots of America forum asking others for ideas for grassroots/grass strips. I received a LOT of good suggestions for airfields. If you are a member of AOPA, I'll send you those links.
Here is the link on Pilots of America:
http://www.pilotsofamerica.com/forum/showthread.php?t=12659
Here is the link on the YahooCitabria forum:
http://groups.yahoo.com/group/CitabriaPilots/message/20185
All of these wonderful folks are an incredible source of information!

I hope to get to meet some of them on my month-long flight low and slow across part of the country.
If you make it down to MO, please fly into our grass airfield for a visit.
http://www.airnav.com/airport/08MO
I'll be glad to send you a jpeg of my proposed route so you can get some of the identifiers of the states you're interested in. I'm skipping WI and MN this trip, but there are some great strips in those states suggested in some of the above links.
Let me know if I can be of further help.
Have a GREAT trip! It sounds like fun!
Diana
Citabria 4216Y