Distance: 24.4 miles out and back
Elevation gain: 3580 ft
(A Best of the Best ride)
Mt. Diablo is another of the three iconic Bay Area climbs. It’s less tranquil than Mt. Hamilton and less scenic than Mt. Tam, but it’s grand nonetheless. No other ride gives you such a distinct sense of “climbing a mountain.” It’s a long climb but never brutal until the last 100 yards. It’s an iconic ride, and there isn’t a serious cyclist in the Bay Area who hasn’t done it, many times. The view from the top is a tourist attraction, and for good reason—they say on a clear day a person looking north and east can see further than from any other spot on the planet except Kilimanjaro. OK, that turns out to be a myth perpetrated by real estate developers—it’s not even the biggest view in California, Mt. Whitney’s being much larger—but you can see bits of 40 of the 58 California counties, you can see the mountains around Lake Tahoe, and you can see rock formations in Yosemite. That’s pretty cool.
That being said, it’s not a ride I do for the scenery, though some love it. The foliage is standard East Bay hill shrub and grass, and the vistas, while large, are mostly of East Bay urban sprawl. There are nice wildflower blooms in season.
The ride is approachable from the north, via North Gate Rd., or the south, via South Gate Rd., and they’re both supposed to be good routes—the north route being steeper and shadier—but the south route is the preferred one and it’s the only one I’ve ever done, both ascending and descending. The first half of the descent (from the summit to the Ranger Station) is as good as anything you’ll ever do—if you manage the traffic.
Mt. Diablo, as much as any ride in Bestrides, is affected by traffic. Diablo is a magnet for tourists, hikers, mountain bikers, and rock climbers—and their cars. On summer weekends, the place is a zoo. If you were ever going to get up early and be on the bike by 7 am (or call in sick and ride on a weekday), this is the time. In the early morning it’s like the road is closed to cars…and in fact it may well be, since there’s a gate across the road that’s typically closed at night (the park “opens” at 8 am). Riding this ride with no or very few cars triples the pleasure, and changes the descent from good to grand. Despite the crush, the hill is very bike-friendly—there are signs at most blind curves reading “Do not pass bikes on blind curves,” for instance.
There is also the weather to consider. The summit can be foggy, windy, and cold even when the weather at the base is benign. The last time I rode Diablo, it was sunny, still, and 67 degrees at the bottom and 47 degrees, with a blasting wind and freezing white-out fog, at the top. I took more clothes than I thought I’d need, and still froze. This doesn’t mean you shouldn’t ride in such conditions—cold and fog keep the car tourists and hikers away, so on that 47-degree day I never saw a car in my lane during the entire descent.
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