The Winter Orienteering Series coincides with Washington Interscholastic Orienteering League (WIOL, or “School League”) events, and together, these series produce the most popular events of the year.

Winter O’ (and School League) ascend in challenge as the season goes on. Events in the first half of the season are held in beginner-friendly venues, some of which are trails-only, while events in the second half move to more forested and challenging venues. The season is capped off with a championship event and an awards ceremony to recognize top participants in both the series overall and championship event.

As with all of CascadeOC’s series events, while it is fun to participate in the entire series, it is not required. Each event is a stand-alone event and open to all!


Sat, Nov 3 Winter Series / WIOL #1 Seattle, WA
Sat, Nov 17 Winter Series / WIOL #2 Shoreline, WA
Sat, Dec 1 Winter Series / WIOL #3 Shoreline, WA
Sat, Dec 15 Winter Series / WIOL #4 Seattle, WA
Sat, Jan 12 Winter Series / WIOL #5 Lakewood, WA
Sat, Jan 26 Winter Series / WIOL #6 Coupeville, WA
Sat, Feb 9 Winter Series / WIOL #7 Tacoma, WA
Sat, Feb 23 Winter Series / WIOL #8 – Championships Carnation, WA

Season Scoring

If you run Long Advanced as an individual at any regular season Winter O’ Series event, you automatically earn points towards your season score. Points are based on your finishing place. Men and women are scored separately, though they compete on the same course.

At the end of the regular season, your best four scores are combined to arrive at your season score. The three men and three women who finish with the highest season scores receive awards!

For the Winter Orienteering Series, regular season points are awarded as follows:

1st Place: 100 points
2nd Place: 95 points
3rd Place: 92 points
4th Place: 90 points
5th Place: 89 points
6th Place: 88 points, and so on.

Tie-break Method
If, after the final series event, two or more competitors have the same total score, the tie is broken as follows:

  1. The individual with the highest individual event score wins the tie.
  2. If the highest individual score is equal, the next highest individual scores are compared; comparison continues in this manner until the tie is broken.
  3. If all individual scores are equal, the result is declared a tie.

The Championship
The Winter O’ Series Championship event is a stand-alone winner-take-all race where regular season results don’t matter! Just run Long Advanced as an individual and you’re eligible to win the Series Championship!

Stick around after the championship for the awards ceremony, where podium finishers from both the Winter Orienteering Series and School League (WIOL) receive a “rock block” (small plaque) to commemorate their achievement.