17 November 2025
Sierra Blair ticks Birch Problem (8B+)
Sierra Blair, with five 8A+โ to her name, has sent Birch Problem (8B+) in Flagstaff Hinterlands. It took her 12 sessions over nine trips to finish it and here is her Instagram video. The 31-year-old placed tenth at the Tokyo World Cup in 2018 and stopped competing in IFSC events the following year.
Can you tell us more about the ascent and the process behind?
Iโm incredibly excited to have finally sent this boulder. Birch Problem tested me the most in terms of tenacity, patience, and power. Cherry Canyon is about 3 hours from where I live and it was many weekends of driving up and trying the climbโฆonly to drive back home without the send. The crux move gave me a lot of issues and it quite literally felt impossible to link the boulder until my send go. Once I did the crux move it was all about keeping it together and not dropping the top. Definitely the boulder I was the most excited to finish and I canโt wait for whatโs next!
Can you tell us more about the ascent and the process behind?
Iโm incredibly excited to have finally sent this boulder. Birch Problem tested me the most in terms of tenacity, patience, and power. Cherry Canyon is about 3 hours from where I live and it was many weekends of driving up and trying the climbโฆonly to drive back home without the send. The crux move gave me a lot of issues and it quite literally felt impossible to link the boulder until my send go. Once I did the crux move it was all about keeping it together and not dropping the top. Definitely the boulder I was the most excited to finish and I canโt wait for whatโs next!
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