This climb is a local favorite. We have shown the route starting at Highway 12, but you can start anywhere or add this into another ride, and since the way in is the way out it we didn’t show it as a round trip. If you are unsure about cycling on gravel roads then you may want to shorten this ride. If you do press on then be sure to stay on the packed tire track of the road and stay out of the loose stuff.
Much of the route shown here is not shown on any maps but it’s easy enough to follow as long as you watch for a few things. The easy part is the trip from Highway 12 to Sugarloaf Park. Just after you pass the kiosk at the park entrance (no fee for bicycles to enter the park) take the gravel road to the left, unless you need water then go into the campground and refill you bottle(s) first. Continue up this until you come to an intersecting road on the right. Turn right here and go around the barrier and continue up the hill. The road surface from the barrier up to the tower is best described as a paved fire-road. It also serves as the trail to Bald Mountain so watch for hikers, especially on weekends. Eventually you come to a point where the road goes left or right. Going right will take you up a steep gravel road which we don’t advise. Turning to the left you will see the top of the ‘Towers’ above the tree line (at this point it looks just like the photo). Continue up this road a short bit and you are there. The Towers aren’t much to look at but the view is one of the best. You can just about see the floor of Napa Valley!