rodent proofing a garage

I usually keep my Dart in a storage unit, and I think I have decided to let the storage unit go, due to price and inconvenience. The storage unit is 20 miles away. I have an old 2 car garage the I plan on cleaning up and sealing any cracks and crevices, in an attempt to minimize rodent infestations (I live on an old farm place, so mice are a nuisance year round). Besides sealing any crack and crevices I can find and new seals on the bottom of the doors, I am also planning on digging up the ground about 18 around 3 sides of the garage and laying down landscaping cloth, then covering that with redrock (my theory is that removing cover, weeds and grass away from the garage may slow the rodents down from entering). Does that sound plausible? Any other ideas, suggestions?
Thanks
Aaron