Trail Running · Colorado

🇺🇸Run Rabbit Run 100:
Course Analysis & Race Readiness

162km with 4,579m of climbing and 4,596m of descent at high altitude, topping out at 3,235m. Ten climbs and forty-two percent downhill make sustained legs and relentless durability the defining tests.

CourseRecon scores your own training against the durability and descending demands that define Run Rabbit Run 100 — the sample analysis below shows exactly how.

162 km

Distance

+4,500 m

Vertical Gain

−4,520 m

Total Descent

Sep 18, 2026

Next Edition · 58 days out

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The Course · GPS-Measured

What 162 km / 101 mi and 4,500 m / 14,770 ft of vertical gain actually look like

Measured from the GPS track: 162 km / 101 mi and 4,500 m / 14,770 ft of vertical gain. This is the terrain you're signing up for: read it before it reads you.

Course Profile

Terrain summary

Claimed vs GPS-Measured

Claimed · Organizer

162km

Distance

+6,220m

Gain

+0.0 km−1,720 m

GPS-Measured

162km

Distance

+4,500m

Gain

Climb & Gradient

+4,500 mTotal Gain

−4,520 mTotal Loss

Gradient Distribution

44%

Flat

≤3% grade

22%

Run-Climb

3–15% up

Steep Climb

>15% up

30%

Descent

downhill

Steepest Sustained Sections

ClimbCRUX

KM 0.1–8.0 · +1,035 m

+13.1%

Descent

KM 151.0–162.0 · −1,052 m

-9.9%

Climb

KM 81.0–85.9 · +459 m

+9.4%

Descent

KM 14.9–26.3 · −849 m

-7.4%

Finish & Cutoff Times

What it takes to finish

Reference finish times from past results — use them to set a realistic goal pace.

17h 43m

Winning time

19h 38m

Top 5

21h 35m

Top 10

36h 00m

Back of pack

What This Race Demands

Four things this course asks of your body

Every course weights the four pillars of mountain-ultra fitness differently. Durability carries 48% of the scoring weight on this course — the terrain makes that the deciding factor.

Weighting shows where readiness is won or lost at this distance — not whether you need each pillar. An aerobic base is a given for a race this long, so it carries little deciding weight even though it's essential — the gaps open on the climbs, descents and the back half.

AerobicSustained engine

Foundational

162km at elevations from 2,140m to 3,235m demands deep, sustained aerobic output.

ClimbingVertical power

19%

4,579m of gain across ten climbs, including a 1,035m opener over 8km.

DescendingEccentric / braking

33%

4,596m of loss across nine descents, with 42% of the course pointed downhill.

DurabilityLate-race resilience

48%

Repeated climb-descent cycles over 162km at altitude tax the legs late.

The Profile in One Line

An ultra-distance high-altitude course where descending volume and cumulative durability outweigh raw climbing.

Aerobic FoundationalClimbing 19%Descending 33%Durability 48%

Here's how CourseRecon reads a course and an athlete

Sample Readiness Analysis

What a readiness result looks like for this course

This is a worked example for a representative strong mountain-ultra athlete — not your score. Connect your own training and the same analysis runs on you.

Sample

OUT OF 100

MOSTLY READY

For a representative strong mountain-ultra athlete

This is a sample — connect your Strava to see your own result.

Pillar Breakdown

Aerobic

The 162km distance sits high, starting at 2,140m and reaching 3,235m, so thin-air aerobic efficiency underpins every kilometer of steady running.

Climbing

Ten climbs total 4,579m of gain, led by a 1,035m ascent at 13.1% right off the start; steep and very-steep grades cover over 13% of the course.

Descending

Descending is the largest terrain feature at 42% of the course, with 4,596m of loss including a 16.6km descent and a 1,052m drop, demanding controlled downhill technique.

Durability

With gain and loss nearly balanced across nineteen distinct climbs and descents, the legs must absorb repeated pounding and still hold form over the full 162km.

km 0–8

The Opening Wall

The race begins with a 1,035m climb over 8km at 13.1%, the biggest and steepest ascent on course. Going out too hard here mortgages the remaining 154km.

km 151–162

The Closing Plunge

The finish drops 1,052m over the final 10.7km at nearly 10% down. After 150km of accumulated loss, quads must still handle this sustained late descent.

whole course

The Downhill Toll

At 42% descending and 4,596m of total loss across nine descents, eccentric leg damage builds relentlessly. Durability, not climbing, decides who fades.

That was a sample