From the Organizer
Join us for our Annual Oak Tree Challenge 5K/1 Mile Run/Walk. Medal for 1 Mile Youth finishers.
ELECTRONIC CHIP TIMING for the 5K run/walk only by Pacific Coast Race Timing
Run the Course all on HARD SURFACES!!!
7:00 a.m. Registration Opens
8:00 a.m. 1 Mile Run/Walk
8:30 a.m. 5K Run/Walk
9:15 am 5K Awards ceremony
Pricing for 1 Mile $20.00
Pricing for 5K $35.00
*Registration must be received by 9-07-26 for the free t-shirt
No political activity, literature, signs, flyers, or pejorative clothing will be permitted at this event.
RAIN OR SHINE EVENT (No Refunds)
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
88°
Typical Low
60°
Chance of Rain
2%
Based on US Climate Normals data from Pomona/Fairplex, 7 mi from the venue.
Host City
Population
50,143
as of 2023
Elevation
588 ft
Nearest Airport
ONT
Ontario International Airport · 16 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 Oak Tree Challenge 5K & 1 Mile Run/Walk, put it on the calendar, and turn “someday” into a start date.
103
Days to train
Coming Up
Los Mugrosos 5K— La Vida Sucia Run
10 miles away
Claremont Freedom 5K
9 miles away
Pride of the Valley 5K & 10K
5 miles away
Albert Rivera Menudo Run
10 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.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
Oak Tree Challenge 5K & 1 Mile Run/Walk
Sep 19, 2026