Lodging and Accommodations are self managed, here are a few recommendations:
H2: Located one block from the Mill District, H2's proximity can't be beat. Stay right downtown with walking access to Healdsburg's many and restaurants, coffee shops, art galleries and bike shop.
The Lodge and
Hotel Trio are located on the north end of town approximately 1.5 miles away from Mill District Velo. Any easy ride on your bike!
Best budget option would be:
Wildhaven Glamping which is 5.4 miles from Mill District so a car would be optimal.
Windsor is a nearby town with budget accommodation options, but will require a car.