Boulder Field 100
18 Miler · 18 miles
Registration open
Registration is open.
Race dateSeptember 12, 2026
Start7:30am
When34 days ago
First held2016
Who's going to Boulder Field 100?
Free. You can start with nothing.
Free, and always will be. NavRun makes money from race-day planning for runners who want it, never from this.
Ultras change constantly, sometimes the morning of. Always confirm with the race director and the official website before you rely on anything here.
Distance
18 miles
Climb
not checked yet
Descent
not checked yet
High point
not checked yet
Time limit
13:30:00
Aid stations
5
Started
not checked yet
Finished
not checked yet
Finish rate
not checked yet
The course
Where it goes
loop · 5 aid stations
The "Uber Hike" & Trail Run. A perfect introduction to the park's rugged beauty.
The race describes the overall course as 90% single track and multi-use trail with about one mile of gravel road; the 18 Miler is framed as the easiest of the three distances ("a perfect introduction to the park's rugged beauty"). Its aid-station miles do not line up with the 50K's, so it appears to run its own shorter loop rather than a truncated piece of the 50K route.
The race
What this one is
The Boulder Field Ultra runs three distances -- an 18-mile hike/run, a 50K, and a 100K -- on a figure-eight loop through Hickory Run State Park near Jim Thorpe, Pennsylvania. The 100K is two full laps of the same 50K loop. The course crosses the park's namesake boulder field and a rugged, mile-long stretch called the Shades of Death Trail, climbing roughly 4,000 feet per 50K loop over mostly singletrack and multi-use trail with only about a mile of gravel road.
First run in 2016, Boulder Field has been held every September since at Hickory Run State Park.
Getting in
Getting in
Entry, lottery and what the race asks of you before race day.
- Lottery
-
No
uberendurancesports.com
- Lottery opens
-
not checked yet
- Lottery draw
-
not checked yet
- Field cap
-
400
uberendurancesports.com
- Registration
-
UltraSignup
ultrasignup.com
- Qualifying
-
not checked yet
- Minimum age
-
not checked yet
- Transfers
-
not checked yet
- Deferrals
-
No
uberendurancesports.com
Running, crewing, pacing or still deciding
How NavRun helps with Boulder Field 100
You are running it
You reach Aid — Mile 9.5, mile 9.5, and you already knew this morning what time that would be.
An arrival time for all 3 stations, worked out from your own training.
Start free →
You are deciding
You find out Boulder Field 100 is months of work away, not years, and you enter.
Put in a race you have already run. NavRun shows you where this one sits from where you are.
No account needed →
Crew access, pacers and drop bags
The rules that shape your day
Anything marked "not checked yet" is a gap in what we hold, never a no from the race.
- Crew allowed
-
Yes
uberendurancesports.com
- Vehicles per runner
-
not checked yet
- Pacers
-
not checked yet
- Muling
-
not checked yet
- Drop bags
-
Yes
uberendurancesports.com
- Cupless
-
not checked yet
- Course marking
-
not checked yet
- Night running
-
not checked yet
- Dogs
-
not checked yet
- Headphones
-
not checked yet
- Crew rules
-
not checked yet
- Pacer rules
-
not checked yet
- Drop bag rules
-
not checked yet
- Cutoff philosophy
-
Hiker friendly time limits for the 18M and 50K distances.
uberendurancesports.com
Aid stations
Every stop, and what you get there
● yes ○ no ? nobody has checked – does not apply to this race
| Mile |
Station |
Cutoff |
Crew access |
Bag |
Pacer |
Med |
To next |
| 0.00 |
Start
|
? |
? |
? |
? |
? |
3.00 |
| 3.00 |
Aid — Mile 3
|
? |
? |
? |
? |
? |
6.50 |
| 9.50 |
Aid — Mile 9.5
|
? |
? |
? |
? |
? |
4.50 |
| 14.00 |
Aid — Mile 14
|
? |
? |
? |
? |
? |
4.00 |
| 18.00 |
Finish
|
9:00pm |
? |
? |
? |
? |
? |
Same race, other lines
Other distances and other years
What it looks like out there
Somebody has been out there with a camera
the tables say the climb is long. these say what long feels like.
One person has been out there with a camera or a microphone.
These are other people's work and we link straight to them. Watching costs nothing and needs no account.
More of them: every race we hold, on film.
Add to this page
What you know
every one of these is read by a person before it changes anything
Ran this race? Tell the next runner what you know.
Nobody sees it until we have read it. No account, no sign-in.
See something wrong or out of date? Suggest an edit.
This changes nothing on the page on its own. Somebody checks it against the race first.
Seen a course preview or a film of this one? Send it over.
Somebody watches it before it goes anywhere near this page. What we are after is footage of this course, on the ground. If it would be just as true of any other race, it is not this.
Have the GPX? Send us the link.
We want the address of the file the race publishes, not the file. We download it from there so the page can say where the line came from.
Are you the race director? Get in touch and we'll make it right.
We read every one of these and we write back. Every fact here carries the source it came from, and the way a wrong one gets fixed is a person checking it against what you tell us.
Where this came from.
Every fact on this page records its source and when we last checked it: 70 sources for this race. Hover a source link to read the sentence it came from.
25% of what we track for a course is filled in. The rest says "not checked yet" rather than guessing.
Ultras change. We will tell you when this one does.
Cutoffs move, races get postponed, lotteries open and close. We read the race's own sources and record where every fact came from. Put your email in and we will send you what changed, and where we read it.
No account, and nothing to cancel.
What happens to your email. Nothing else. I do not sell it, and I will not send you anything except this race changing. One click gets you out.
I keep this catalog because the information is scattered and hard to trust. Telling you when it moves is the same job.
