buzz wrote:
what time of year does the road typically become usable by bike? could one hope to climb it in early april?
In early April you are still dealing with winter conditions in the ADK. It would be a crapshoot whether or not the road is icy or snow-covered then. The summit is still likely not safe but depending on what kind of winter we get, it could be fine.
Edit to add: As this thread is nearly 10 years old, the information above is out of date. You are now able to pay a bicycle toll at the toll booth (or buy a season pass if you plan to climb it a bunch). So you don't have to try to do it before opening, or after closing.