June 1-3 – El Reno  

From triokc.club:

This historic race is as traditional as they come, the festivus features: an Aquathlon on Thursday, Olympic Distance Triathlon on Saturday,and starting off with a Sprint Triathlon to follow start of Olympic. The Sprint Triathlon will include the 2017 TRI-OKC High School Championship, with entry at a special discounted rate. The Olympic Triathlon will be the featured race as it is home to Oklahoma State Championship Triathlon.

For more information visit triokc.club.