Trailrace logo
Find your race Upcoming Find a Qualifier
Search Dashboard Saved Races Calendar
Trailrace logo

Helping the trail running community discover, plan for, and thrive at the world's best trail races.

Find Races

  • Search all trail races
  • Explore collections
  • Race series
  • Race qualifiers

Races by Location

  • Colorado trail races
  • California trail races
  • Utah trail races
  • Arizona trail races
  • Washington trail races
  • All US trail races

Lottery Odds

  • Western States 100
  • Hardrock 100
  • High Lonesome 100
  • UTMB
  • All calculators

Company

  • About
  • Roadmap
  • Terms of service
  • Privacy policy

Feedback

  • Send Feedback
  • Feature Requests
  • Report a Bug

© 2026 Trailrace.co. All rights reserved.

Built on bad decisions in Boulder, CO.

Western States 100 Lottery Odds Calculator

See your real chance of selection this year, your estimated years-to-entry, and the honest math behind the wait.

Race page
Years applied1 year
1 yr10 yrs

1 year = 1 ticket in the hat

0.3%chance of selection this year

That's 1 in 333 — about as likely as being born on Christmas Day.

369
field size (start line)
~10 yr
expected wait (average)
2035
even odds (50/50) by

Your lottery chances over time

First-timer odds keep falling as applications climb. Stacking tickets fights back — slowly.

First-year applicant odds trendYour odds (that year)Cumulative (in by then)Applicants trend

Source: wser.org lottery statistics. Tickets = 2^(years−1), doubling for every prior unsuccessful application — no cap; 512 (10 applications) is just the top tier in the 2026 field and grows over time. Not affiliated with the race organizations.

// in the meantime

Even odds? Not until 2035.

Working toward running Western States? Start planning your path by finding a qualifier to sign up for.

Crazy Mountain 100
Wilsall, MT, US · Jul 2026
100 Mile
Angeles Crest 100 Mile Endurance Run
Wrightwood, CA, US · Oct 2026
100 Mile
Black Canyon Ultras 100K
Spring Valley, AZ, US · Feb 2027
100K
Run Rabbit Run 100
Steamboat Springs, CO, US · Sep 2026
100 Mile
Bighorn Trail 100 Mile Endurance Run
Dayton, WY, US · Jun 2026
100 Mile
Never Summer 100K
Gould, CO, US · Jul 2026
100K
Browse Western States qualifiersOr plan your whole season →

How the Western States lottery works

  • One weighted pool for everyone — no separate categories.
  • Each year you apply and miss, your tickets double: 1, 2, 4, 8, 16, etc
  • You must finish a qualifying race and re-register for every lottery you enter.
  • Since 2020 those entries needn't be consecutive — sit a year out and you keep your tickets.

Tickets

Formula
2^(years − 1)
Calculation
2^(1 − 1)
Tickets
1 ticket

Odds

The pool
369 spots · 11,328 applicants
Your odds
0.3%

Tickets double for each prior year you applied without getting in (since 2020 they needn't be consecutive). Odds are read from Western States' published 2026 lottery statistics (official Monte Carlo simulation).

wser.org 2026 lottery statistics

Odds at each ticket count

The published weighting curve — every extra ticket moves you along it. Your current tier is highlighted.

More lottery calculators

Hardrock 100
Four pools, split by gender and finisher status. Never-Finished tickets double for every prior unsuccessful year.
146
field size
2,745
recent applicants
High Lonesome 100
Two gender pools. Tickets double for every prior unsuccessful year, with a bonus for trail-work and volunteering.
250
field size
1,216
recent applicants
UTMB
A weighted draw on Running Stones. UTMB publishes no per-entry odds, so we show the demand instead.
2,800
field size
25,000
Finals applicants