
Mary Lou Triathlon is a triathlon race on June 13, 2027 in Weippe, ID, with an entry fee of $25.
From the Organizer
June 13, 2027
This race was previously named the Bald Mountain Triathlon, and was held at Bald Mountain Ski Area in 2020, but moved to Deyo Reservoir for 2021 and 2022 and was renamed in honor of the Deyo Family matriarch in 2023.
The race will be located at the Deyo Reservoir outside of Weippe, Idaho. The swim will take place from the sandy beach and traverse 300 yards before transitioning to mountain bike gear and leaving the reservoir along Schmidt Mill Road to 3-mile Road to Fidler Road and then along a forested trail back to 3-mile Road and the reservoir, approximately 13 miles. The run course will be the well-travelled 2.2 mile trail around the reservoir. There will be a single transition area.
Packet pick up:
Saturday, June 12, 3:00 - 5:30pm at the Schmidt House across from Deyo Reservoir
Sunday, June 13, 6:30 - 7:00am at Deyo Reservoir
Athlete briefing: Saturday, June 12, 5:00pm at Schmidt House and Sunday, June 13, 7:30am at Deyo Reservoir
Start time: Sunday, June 13, 8:00 am; Deyo Reservoir
Limited Parking Available
Camping available http://www.weippe.com/deyo/
Safety:
No roads are closed for this race, however there will be traffic control at major intersections. It is your responsibility to yield to traffic. The good news is most of this race is on lightly travelled gravel roads and trails and traffic is minimal in the areas where you will be sharing the road.
Rules:
This is not a USA Triathlon (USAT) sanctioned event and you do not need to have a USAT card to participate, however we will be abiding by USAT rules. https://www.teamusa.org/USA-Triathlon/About/Multisport/Competitive-Rules
We discourage the use of wetsuits for this short swim, however if water temperature is less than 84 degrees they are allowable.
No lifejackets allowed.
Helmets required for the duration of the bike ride.
Youth Triathlon Saturday, June 12 at 6:00 pm at Deyo Reservoir
*Youth Registration* https://docs.google.com/document/d/1UFJPlsopJjKuylJULo235fi_rlLf866lqlYi8h0RVIE/edit?usp=sharing
Events
Weather
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
78°
Typical Low
50°
Chance of Rain
31%
Based on US Climate Normals data from Kamiah, 10 mi from the venue.
Host City
City Elevation
3,048 ft
Nearest Airport
LWS
Lewiston Nez Perce County Airport · 51 mi
Major Hub
GEG
Spokane International Airport · 114 mi
Time Zone
Pacific Time
From Endurance Grid
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Race Location
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From Endurance Grid
Endurance Grid is here to help you understand the sport, decide if it’s the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer’s event page.
Three sports, one race — swim, bike, run in sequence, with transitions that are a discipline of their own.
Open water, open roads, and competition with yourself. Cross the finish line knowing what it took to get there.
Swim, bike, run — back to back. The sprint distance makes it far more accessible than most people think. Three sports in one race means three movements to train and race day never gets monotonous.
Coming Up
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PEAK 7B Youth Triathlon
137 miles away
Plan your trip
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Mary Lou Triathlon
Jun 13, 2027