Tuesday Night Twilights

April - Sept, 2019


Tuesday Night Twilight 2019 Schedule

April 2, 23 | May 7, 14, 21 | June 25 | July 9, 16 | August 27 CX | September 3 CX

Nightly Schedule

Road races

5:30 to 5:55 pm: C Race/Junior Race

25 min - Coaches present. Intended for Cat5 & new racers (including women)

6:00 to 6:30 pm: Women/B Race

30 min - No coaches. Intended for all Women and Cat3 & 4 Men

6:35 to 7:10 pm: A Race

35 min - No coaches. Intended for Cat2 & 3

7:15 to 8:00 pm: Elite Race

45 min - No coaches. Intended for Pro, 1 & 2

CX races

5:30 to 6:30 pm: Clinic

60 min - All racers who want to learn how to cyclocross

6:35 - 7:10 pm: B Race

35 min - No coaches. Intended for Cat3, 4 & 5

7:15 - 8:00 pm: A Race

45 min - No coaches. Intended for Pro, 1 & 2


All races are at the Sonoma County Fairgrounds.

No license required.

Rain Cancels

In the event of rain, the event will be cancelled. Wet pavement doesn't make for safe racing.


We need volunteers for this event! If you can help us run this event please shoot an e-mail to javier_sanchez@keysight.com.


Registration is OPEN! Save big by buying more than one entry. You can use your entries on any of the available dates. Buy a 10 pack for big savings. The last two dates on the calendar are CYCLOCROSS FORMAT!

Register for SoNoMas

Registration for SoNoMas opens on January 1st and is $79 per rider ($59 for the Little Piggy). For that you get stocked and staffed aid stations, a categorized competitive race environment on well-marked and technically demanding singletrack, a traffic-controlled mass-start, an amazing prize list, cash payouts for pro racers and a huge post-race meal to bring you back from whatever cave you found yourself in.