National Brain Tumor Ride
About this race
Our Gray Nation Endurance® community will come together on May 17, 2026 for the National Brain Tumor Ride, our signature endurance event, to raise awareness and funds to support the needs of patients with brain tumors and their families. Put meaning behind your miles and ride in person, plan an event in your area, or participate virtually. Your community is here. Let’s discover a cure, together.
Pick your distance
Cycling
10 Mile Ride
25 Mile Ride
50 Mile Ride
Virtual
Running
Volunteer/Here to Cheer
Typical race-day weather
Based on 2 years of Open-Meteo archive data for this event's race dates in Waltham, plus the 3 days either side.
The sun rises at 5:21 AM and sets at 8:01 PM local time (EDT) in Waltham on May 17, 2026 — 14h 40m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Other races near Waltham
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Lexington Legacy 5k
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 4 Waltham events
Spotted something wrong? Tell us and we'll fix it.