
From the Organizer
This is an Invitation-Only, No-Fee, Low-Aid race held in the Enchanted Forest Nature Sanctuary in Titusville, Florida the third weekend in December. The 2026 dates are Saturday-Sunday December 19-20, 2026. Race start time is 7:00 AM Saturday morning, and runners have 32 hours exactly to finish 29 loops of a 3.46-mile course for a total of 100.34 miles. The race has a hard 60-runner cap on entries, per agreement with the park.
In order to run, you must receive an Invitation to Run. In order to get one of those, you need to click on the WAITING LIST button located above, ANY TIME between 12:01 AM June 1, 2026 and 11:59 PM June 30, 2026 with a Request for an Invitation to Run. This will automatically place you on the Wait List, and the Entry List will be drawn from this Wait List on or about July 3, 2026.
Please do BOTH of us a favor and use an email address that you KNOW you will be using for the entire year. Each year, I get a handful of Requests from people using some email address that ends up being disabled somehow, and when I try and contact them at a later date, the email ends up floating endlessly in the ether of the universe, and they never receive my follow-up communications. I would strongly suggest against using a work email address, since work situations can and do change at a moment's notice.
Invitations to Run will be sent out via email on or about July 3, 2026. Everyone will either receive an Invitation to Run, or will be given a place on the Wait List.
It matters not how many ultras or 100-milers you have run, nor how fast you are. It matters not if you're running for your own reasons, or if you're running for a charitable cause greater than yourself. What matters is that you want to test yourself against the course and the time limit, and that you take your entry into the race seriously.
The Selection Process is unfair, just like life is unfair. No race that has more possible runners than entry slots has an entry process that's fair. Umstead's process of first come, first served fastest computer wins, is unfair. Western States' lottery system is unfair, Hardrock 100's logistical ticket system is unfair, Massanutten's stock-market-based system is unfair, and the Barkley Marathons' entry process is unfair. The process for selection into Ancient Oaks is no less unfair than any of those processes, and may be even more unfair than any of those other processes. The Selection Process is also private, and will not be disclosed, since it would lead to some runners trying to 'game' the system. IMPORTANT: THERE IS NO BUCKLE AS AN AWARD FOR FINISHING. There hasn't ever been a buckle offered since the race's inception, and as of this writing, there are no plans in the works to offer one in the future. If any of this is a problem for you, then there are more than 150 other 100-mile races to choose from, and you should choose to run one of those other races.
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
71°
Typical Low
54°
Chance of Rain
26%
Based on US Climate Normals data from Titusville, 7 mi from the venue.
Host City
City Elevation
8 ft
Nearest Airport
SFB
Orlando Sanford International Airport · 28 mi
Time Zone
Eastern Time
From Endurance Grid
Line up lodging and travel early to lock in your race weekend.
Race Location
Your Next Start Line
Every finish line starts with a single decision. Claim your spot at Ancient Oaks 100-Mile Endurance Run, put it on the calendar, and turn “someday” into a start date.
185
Days to train
Coming Up
COCOA INTERNATIONAL HALF MARATHON - 1mile - 5k - 10k - 15k - 21k
12 miles away
Paint the Town Purple 5K
12 miles away
Teen Mission Fall Fun Run
10 miles away
Space Coast Marathon & Half Marathon
12 miles away
From Endurance Grid
This race spans more than one sport — here’s a guide to each, so you can understand what’s involved and decide if it’s the right fit. For course distances, logistics, and race-day specifics, always defer to the race organizer’s event page.
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.
Running off-road — dirt, singletrack, and mountain paths — from 5Ks to ultras. The terrain, not the pace, is the whole point.
Frequently Asked Questions (FAQs)
Ancient Oaks 100-Mile Endurance Run
Dec 19, 2026