
From the Organizer
The 12th Annual Filthy 50+ will take you through various areas of San Dieguito River Park and Black Mountain Park. Fast and flowy for all skill levels. The 30 mile riders will head out and turn around at the 15 mile mark and the 50+ mile riders will continue on to the Black Mountain Park area where you will encounter a lollipop and new trails to go with it! The course will be fully marked with Pink Flags and Red Arrows. Fully stocked feed stations will be placed throughout the ride to keep you fueled up.
There will be a kid’s ride supported by Team Quick n’ Dirty at 8:45am. Awards will be given out immediately following the kids ride. Registration for the kid’s ride will be online and onsite.
When riding the course please be aware that the trails will be open to the public so please pay attention to other riders, hikers, and horseback riders. Please pay special attention when riding the switchbacks portion of the course and use courtesy when passing. Thanks!
WHEN:
Saturday, October 31, 2026
WHERE:
REGISTRATION:
COURSES:
FEED STATIONS:
Please stop if you need to refuel. There will be plenty of Hammer Nutrition products available. The mile marker and addresses are below if your support crew want to do hand-ups.
#1– 11 Miles & #4– 42 Miles (12653 Sunset Dr Escondido, CA 92025)
#2– 21 Miles & #3– 32 Miles (San Dieguito River Park San Diego, CA 92127)
FILTHY 50+ REGISTERED RIDERS WILL RECEIVE:
ENTERTAINMENT:
The primary goal of the Filthy 50+ Fun Ride with Benefits is to bring the mountain biking community together and to celebrate what we all love to do, RIDE OUR BIKES! Additionally, we want to bring awareness concerning the trails we ride on, as well as give back to the organizations that keep us riding on those trails. As part of the Filthy 50+ we urge you to help us give back by donating to the SDRP Bike Patrol.
Events
Weather
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
82°
Typical Low
48°
Chance of Rain
9%
Based on US Climate Normals data from San Pasqual Animal Pk, 3 mi from the venue.
Host City
Population
149,913
as of 2023
City Elevation
656 ft
Nearest Airport
CLD
McClellan-Palomar Airport · 11 mi
Major Hub
SAN
San Diego International Airport · 28 mi
Time Zone
Pacific Time
From Endurance Grid
A mid-size host city. Enough lodging and amenities to keep race weekend easy, without big-city sprawl.
Race Location
Your Next Start Line
Every finish line starts with a single decision. Claim your spot at Filthy 50+ - MTB Ride with Benefits, put it on the calendar, and turn “someday” into a start date.
136
Days to train
Coming Up
Summer Series - Race #7
9 miles away
Summer Series - Race #8
9 miles away
Rim Nordic XC MTB Race Series #1
78 miles away
Rim Nordic XC MTB Race Series #2
78 miles away
From Endurance Grid
Endurance Grid is here to help you understand the sport, decide if it’s the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer’s event page.
Mountain biking takes place on singletrack and natural terrain where reading the trail matters as much as fitness — cornering, braking, and instinct on dirt are skills that only come from time in the saddle.
Events range from beginner-friendly cross-country races to technical enduros, and the trail community is one of the most welcoming in endurance sport.
XC races, enduros, and fat bike events across U.S. trails. Technical, physical, and completely different from anything on pavement.
Frequently Asked Questions (FAQs)
Filthy 50+ - MTB Ride with Benefits
Oct 31, 2026