Experience the thrill of cycling through some of California's most scenic routes with Quackcyclists' 2026 Best of the Bay and Beyond Triathlon. This unique package offers participants the chance to tackle three double-century rides, each offering a distinct challenge amidst breathtaking landscapes. The Best of the Bay double century takes you along the picturesque coastal roads of Marin County, where you'll enjoy stunning ocean views and wind-swept trails. The Carmel Valley double century then invites you into the heart of Central California's rolling hills, perfect for those seeking varied terrain and a test of endurance. Lastly, the Knoxville double century in Tennessee provides a different challenge with its mix of rural roads and scenic vistas. For an unparalleled experience, sign up now to take on all three rides at just $150 per event – a significant savings over individual registrations. This package is not only about cycling; it's about immersing yourself in the rich cultural tapestry of these regions while enjoying camaraderie with fellow cyclists. If you're looking for additional perks, Quackcyclists also offers referral discounts. To qualify, simply refer a new rider and provide their name to [email protected] by September 15, 2026. Both the referring and referred riders must register before this date. Successfully referred riders will enjoy a $85 discount on their registration. For those eager to support friends or family members while saving yourself some dollars, refer them today! Remember, each referral can only be used once, so act fast to secure your exclusive offer. Register early to ensure your spot in these legendary rides and take advantage of the unique discounts Quackcyclists has to offer. Contact [email protected] for more information on how to bundle these events or if you have any questions about registration and payment processes.
Races Offered
DBL-BOB RIDERS - BEST OF THE BAY Double Century Early-bird Registration - Price increases on 7/16/2026.
Oct 03, 2026
straighten
Distance —
321.9K
terrain
Type —
Cycling
timer
89 days remaining
sell
$170.00
DBL-BOB RIDERS - First Time BOB-Rider (Referred) 50% Discount. Ends 9/15/2026.
Oct 03, 2026
straighten
Distance —
321.9K
terrain
Type —
Cycling
timer
89 days remaining
sell
$85.00
DBL-BOB RIDERS - Referral of BOB-First-time Rider Discount. Ends 9/15/2026.
Oct 03, 2026
straighten
Distance —
321.9K
terrain
Type —
Cycling
timer
89 days remaining
sell
$145.00
Weather History
These values represent the 3-year monthly averages for October in Castro Valley.
thermostatTemperature
12.5° / 22.6°
wb_sunnyFeels like
11.2° / 20.9°
light_mode
Avg sunshine hours
9h 41m
water_drop
Avg rainfall
0.6 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
7.6 km/h (Light breeze)
opacity
Sweat loss rate
Moderate
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Moderate (4.0)
humidity_mid
Humidity
70.4%
wb_twilight
Sunrise
07:18
nightlight
Sunset
18:29
About Castro Valley
Learn more about the host city, Castro Valley.
Castro Valley is an unincorporated town in the inner East Bay in the Bay Area of California. It has a population of about 60,000 and is located north of Hayward and east of San Leandro and south of the Oakland hills. Since it is unincorporated, Castro Valley is governed by the County of Alameda, which has its county seat in Oakland.