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About RaceIndexOur methodologyData coverageCyclingTriathlon
  • Marathon
  • 42.2 km
  • Boulder
  • Event weekend starts
  • Past event

Boulder Rez Marathon

This race edition

Race date
Date not confirmed for this distance
Race timezone
Timezone not confirmed
Edition status
Status not confirmed

Entry options

2026 edition

Entry options are not yet confirmed for this edition. Check the organiser before making plans.

Official event website ↗
Plan my trainingPlan my paceData current as of

Decision summary

Boulder Rez Marathon at a glance

Typical conditions
60/100

Historical race-date favourability, not a forecast

Evidence depth
32 verified facts

Source facts available

Route details

Known course facts at a glance

Methodology →

Boulder Rez Marathon has known course details for its marathon race. The summary below keeps the focus on what is confirmed for the course.

Official distance
42.2 km
Terrain
Road, Trail
Scenery
Parkland, Mountain, Lakeside

Quick answers

What runners ask first

How hilly is the Boulder Rez Marathon?

The Boulder Rez Marathon is described as flat. The course listing puts the climb at 61 m. The course notes also call it flat, fast course running alongside the Boulder Reservoir on dirt roads and trails, with views of the reservoir and the Rocky Mountains.

Where does the Boulder Rez Marathon route go?

The Boulder Rez Marathon route starts at Boulder Reservoir, 5565 51st St, Boulder, CO 80301 and finishes at Boulder Reservoir. Underfoot, expect mostly dirt roads and trails (single track and packed-dirt trail), with paved park roads at the start and finish. It passes Boulder Reservoir and Rocky Mountains. Run on a scenic, USATF-sanctioned course.

What should runners know on race day for the Boulder Rez Marathon?

Staggered starts by distance (marathon 7:15am, 3/4 marathon 7:20am, half 7:25am, 10K 7:30am). Packet pickup Friday before race (3:00-6:30 pm at Fleet Feet Boulder) and race-day morning at the finish-line area (6:00-7:30 am).

Race character

Scenery

  • Parkland
  • Mountain
  • Lakeside

Terrain

  • Road
  • Trail
Elevation character
Flat
Technicality
Non Technical
Source-stated ascent
61 m
Net elevation
200 m

Entry, logistics and records

Entry requirements

Entry status
Past event: The listed edition date has passed.
Cut-off
Course closes at 2:00 pm; staggered starts from 7:15 am (Marathon).
Qualification status
Not advertised as a Boston qualifier; course is described as USATF Sanctioned but not certified, and run mostly on dirt roads and trails.

Race day logistics

Wave start
staggered starts by distance (marathon 7:15am, 3/4 marathon 7:20am, half 7:25am, 10K 7:30am)
Medal
Finisher medal included with entry.
Finisher tee
Participant shirt included with entry.

Access and course status

Start
Boulder Reservoir, 5565 51st St, Boulder, CO 80301
Finish
Boulder Reservoir

Course facts

Course type
Loop
Surface
Mostly dirt roads and trails (single track and packed Dirt trail), with paved park roads at the start and finish.
Landmarks
Boulder Reservoir, Rocky Mountains
Notable features
  • Run on a scenic, USATF-sanctioned course
  • distances offered are Marathon, 3/4 Marathon, Half Marathon, 10K and a Marathon Relay. Awards for overall top 3 male/female plus age groups from 19 & Under through 80+
  • Packet pickup Friday before race (3:00-6:30 pm at Fleet Feet Boulder) and race-day morning at the finish-line area (6:00-7:30 am)
  • Flat, fast course running alongside the Boulder Reservoir on dirt roads and trails, with views of the reservoir and the Rocky Mountains

What are typical race-day conditions?

  • 21°CTypical temperature
  • 15 kphTypical wind
  • 1 mmTypical rainfall
  • 60Favourability /100
Typical conditions for the race date and locality, warmer than the endurance-optimal window. These are climatological norms, not a forecast, and are shared across every distance at this event.

How we calculated this

Published facts and derived model outputs on this page are tied to stored sources or a published, version-locked methodology. We show the provenance so runners, coaches and organisers can check it. Data on this page is current as of .

Derived numbers use scoring-methodology-v1.0.

Sources used on this page (2)

Read the full methodology →