Sierra Road and Felter Road loop from Milpitas

This loop is considered a moderate to hard road ride, requiring good to very good fitness levels. Sierra Road is particularly infamous for being one of the most difficult climbs in Silicon Valley, with sustained gradients averaging 9.6% to 10% and sections reaching up to 19%. Felter Road also presents challenging pitches but includes more forgiving flat and downhill sections.

The komoot tour data estimates this 30 km (18.6 miles) racebike loop takes approximately 1 hour and 43 minutes of active cycling time. However, due to the significant elevation gain of over 670 meters (2,200 feet) and the challenging climbs, actual completion times can vary widely based on fitness levels and stops.

Both Sierra Road and Felter Road are generally well-paved. Sierra Road is characterized by its sustained steep inclines and sharp turns on the ascent. The descent of Felter Road is often praised for its fast sections with long sightlines and technical interest, offering an exhilarating experience.

While the lower sections of Sierra Road can be less scenic, the views from the summit are vast, overlooking the San Jose sprawl. As you continue onto Felter Road, the scenery improves significantly, offering sights of hobby farms, rolling grass-and-oak hillsides, and expansive vistas of the San Francisco Bay. The ride along the ridge on Felter Road provides quiet horizons and mountain silhouettes, including a notable View of San Jose from Sierra Vista Open Space Preserve.

The best time to cycle this loop is typically during the spring and fall when temperatures are milder. Summer can be very hot, especially on the exposed climbs, while winter can bring rain and cooler conditions. Always check the weather forecast before heading out, as conditions can change rapidly in the hills.

Parking is generally available in Milpitas, near the start of Sierra Road. Look for street parking in residential areas or designated public parking lots that allow for extended stays. Always be mindful of local parking regulations and signage.

No specific permits or entrance fees are required to cycle the public roads that make up this loop. The route passes through areas adjacent to or within the Sierra Vista Open Space Preserve, but as long as you stay on the public roads, no special access is needed.

This route is primarily a road cycling loop on public roads, so it is not designed as a dog-friendly trail in the traditional sense. Dogs are generally not recommended for this type of strenuous road cycling. If you plan to visit the adjacent Sierra Vista Open Space Preserve, please check their specific regulations regarding dogs, as rules can vary.

Given the 'fierce' and 'arduously steep' nature of Sierra Road, a key strategy is to pace yourself from the start. Many cyclists find themselves needing to stop and recover. Consider using a compact crankset and a wide-range cassette to have lower gears available. Hydration and nutrition are also crucial. For the descent of Sierra Road, be prepared for technical sections with switchbacks and steep pitches, requiring careful braking.

Yes, the route intersects with several other paths. Notably, it passes through sections of the Bay Area Ridge Trail - 02 - East Bay and the Bay Area Ridge Trail - 03 - South Bay. Other intersecting trails include Tasman / Alum Rock Light Rail Corridor, I-680 Corridor to Silver Creek, and various segments of the Sierra Vista Trail.

Milpitas, being the starting and ending point, offers various options for cafes, restaurants, and convenience stores where you can refuel before or after your ride. There are no services directly on the challenging climb sections of Sierra Road or Felter Road, so plan to carry all necessary water and snacks with you.