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Rider check-in

Rider check-in is 6:30 am to 7:30 am for 100 mile road and 100K gravel routes and 7:30 am to 8:30 am for all others at St Mary's (8:30 am to 11:30 am if you use the alternative car-free start). We urge slower riders to get an early start.

Post-ride Meal

Hot food is available at the finish (St Mary's) from noon until 6:00 pm.

Rest Stop Opening and Closing Times

Rest Stop Opening Time Closing Time
Ivy Park (100 mi) 8:15 am 10:30 am
Ivy Park (100K Gravel) 11:00 am 2:00 pm
Island Picnic Area (50, 75, 100, Gravel) 8:30 am 12:15 pm
Port Costa (75 mi and 100 mi) 9:45 am 2:30 pm
Briones (All Routes except Gravel) 10:45 am 4:00 pm

SAG support on each course segment ends correspondingly.

30 and 50 Milers, Don't Start Too Early

For our 30 and 50 mile routes, please do not start too early. If you start before 8:00 am, or hammer around the route, you might arrive at our Briones rest stop before it opens at 10:45 am, or at lunch before it opens at noon. Slow down, be safe, and enjoy the ride!

100 Milers, Start Early

Start early and keep moving if you want to complete the entire 100 mile route before the 6:00 pm food cutoff. A rider who starts early and averages 11 mph rolling speed between rest stops (which is midpoint of GPC's T pace) and spends 15 minutes at check-in and each rest stop should finish around 5:00 pm. Here is a suggested timetable.

Location milepoint Arrive Depart
Check-in 0 6:30 6:45
Ivy Park 24 9:00 9:15
Island 45 11:05 11:20
Port Costa 69 1:25 1:40
Briones 87 3:30 3:45
Finish 100 4:50
Assumes 11 mph speed and 15 min rest stops.

Time Cut

75 mi and 100 mi Riders who arrive at the intersection of Castro Ranch Road and Alhambra Valley Road after 1:00pm should TURN RIGHT onto Alhambra Valley Road and follow the 50 mile route arrows to Briones Rest Stop and then to the finish. This shortcut will save about 24 miles of riding and put you on track to comfortably complete the course within our expected time limits. If you continue on the longer route you will probably get to Port Costa and Briones rest stops after they close and you will probably be too late for the hot food and party at the finish.

Overall Closing Time

Overall closing time is 6:00 pm. We won't try to haul you off the course at 6:00 pm (these are public roads, you can ride all night if you want!) but at 6:00 pm our volunteers will be packing up to go home.

T-shirt art from the 2004 Century
by Adrian Fernández from a 1925 poster by Fritayre