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Optimism

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Events

Beginner Friendly

Sprint Triathlon

Price: $84.59
incl. $5.73 Fee
Time: 8:00AM PDT 12:30PM PDT
Registration Opens August 5, 2026 at 12:00am PDT
Open to ages 18+.

Olympic Triathlon

Price: $84.59
incl. $5.73 Fee
Time: 8:20AM PDT 12:30PM PDT
Registration Opens August 5, 2026 at 12:00am PDT
Open to ages 18+.

Sprint RunBikeRun (5km run, 15km bike, 5km run)

Price: $84.59
incl. $5.73 Fee
Time: 8:00AM PDT 12:30PM PDT
Registration Opens August 5, 2026 at 12:00am PDT
Open to ages 18+.

Sprint SwimBike

Price: $84.59
incl. $5.73 Fee
Time: 8:00AM PDT 12:30PM PDT
Registration Opens August 5, 2026 at 12:00am PDT
Open to ages 18+.

Sprint SwimRun

Price: $84.59
incl. $5.73 Fee
Time: 8:00AM PDT 12:30PM PDT
Registration Opens August 5, 2026 at 12:00am PDT
Open to ages 18+.

Sprint Swim (400 yards)

Price: $26.29
incl. $2.43 Fee
Time: 8:00AM PDT 12:30PM PDT
Registration Opens August 5, 2026 at 12:00am PDT
Open to ages 18+.

5K

Price: $26.29
incl. $2.43 Fee
Time: 8:00AM PDT 12:30PM PDT
Registration Opens August 5, 2026 at 12:00am PDT
Open to ages 18+.

Olympic RunBikeRun (5km run, 39km bike, 10km run)

Price: $84.59
incl. $5.73 Fee
Time: 8:20AM PDT 12:30PM PDT
Registration Opens August 5, 2026 at 12:00am PDT
Open to ages 18+.

Olympic SwimBike

Price: $84.59
incl. $5.73 Fee
Time: 8:20AM PDT 12:30PM PDT
Registration Opens August 5, 2026 at 12:00am PDT
Open to ages 18+.

Olympic SwimRun

Price: $84.59
incl. $5.73 Fee
Time: 8:20AM PDT 12:30PM PDT
Registration Opens August 5, 2026 at 12:00am PDT
Open to ages 18+.

Olympic Swim (1640 yards)

Price: $26.29
incl. $2.43 Fee
Time: 8:20AM PDT 12:30PM PDT
Registration Opens August 5, 2026 at 12:00am PDT
Open to ages 18+.

10K

Price: $26.29
incl. $2.43 Fee
Time: 8:20AM PDT 12:30PM PDT
Registration Opens August 5, 2026 at 12:00am PDT
Open to ages 18+.
Must provide own tent, other tent sizes available upon request

Sponsor - 10x10 Tent

Price: $526
incl. $26 Fee
Time: 8:00AM PDT 12:30PM PDT
Registration Opens August 5, 2026 at 12:00am PDT

2027 Cal Tri Lake Perris - 4.11.27
The accessibility of Lake Perris from LA (75 miles southeast), San Diego (80 miles north) & Orange County (80 miles east) makes it a convenient option for day trips or weekend getaways. Visitors can enjoy a variety of recreational activities, including boating, hiking, and camping, while being relatively close to urban centers. Lake Perris State Recreation Area offers camping facilities, including developed campgrounds with amenities such as restrooms, showers, and picnic tables. Campsites are available for tents and RVs.

Location
Lake Perris State Recreation Area - Lot 9 (Parking $10)
17801 Lake Perris Dr
Perris, CA US 92571-7018

12 EVENT OPTIONS. 6 Olympic distance events (Triathlon, RunBikeRun, SwimBike, SwimRun, 1640 Yard Swim & 10K Run) and 6 Sprint distance events (Triathlon, RunBikeRun, SwimBike, SwimRun, 400 yard Swim & 5K Run). Triathlon = swim + bike + run. Typically, the swim and run distances are standard but the bike distance varies from race to race. Check out the course maps for more detailed information.
TO DO. Lake Perris. Mission Inn Museum. March Field Air Museum.
AIRPORT. Ontario (ONT)
AIR TEMPERATURE (AVG). 49 F / 77 F
WATER TEMPERATURE (AVG). 68 F. Wetsuit legal.

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