2008-09: Juho Olkinuora returned to Finland after spending a season with the Chadder's midget team in Utah and played for the HIFK U20 team. Sharing the goaltending duties with Edmonton prospect Frans Tuohimaa, he had a 3.81 goals against and .887 save percentage with 1 shutout in 27 games. HIFK finished 12th but avoided relegation in the Karsintasarja playoffs. In six playoff games Olkinuora had a 2.33 goals against and .914 save percentage.
2009-10: Olkinuora split the goaltending with Tuohimaa as a 19-year-old in his second season with the HIFK U20 team. He had a 2.15 goals against and .923 save percentage with 3 shutouts in 24 regular season games. HIFK was first in the regular season and lost to Karpat in the SM-Liiga U20 finals. Tuohimaa saw the bulk of the action in the playoffs and in four playoff games Olkinuora had a 4.98 goals against and .831 save percentage.
2010-11: Olkinuora returned to North America to play for the USHL's Sioux Falls Stampede and pursue an NCAA scholarship. Sharing the goaltending duties with future Minnesota State goalie Stephon Williams (NY Islanders), he appeared in 27 games and was 14-13 with 1 shutout; posting a 2.78 goals against and .900 save percentage. The Stampede finished third in the Western Conference and reached the conference semifinals against eventual Clark Cup champion Dubuque. Olkinuora was 2-3 in five playoff games with a 2.79 goals against and .911 save percentage. In June 2011 he committed to playing college hockey at Denver in 2011-12.
2011-12: Olkinuora appeared in 22 games for the University of Denver as a freshman. Sharing the goaltending with junior Adam Murray and sophomore Sam Brittain (Florida), he was 9-8-3 with 2 shutouts and had a 2.18 goals against and .924 save percentage. The Pioneers finished third in the WCHA and reached the WCHA Broadmoor Trophy championship; receiving an at-large bid to the NCAA tournament and falling to Ferris State, 2-1, in a Midwest Regional semifinal game.
2012-13: Olkinuora signed a two-year entry-level contract with the Jets in April 2013 following his sophomore season at Denver and made his pro hockey debut with Winnipeg AHL affiliate St. John's. He stopped 25 of 28 shots in his only start for the IceCaps, a 4-1 loss to Hamilton on April 19th. Olkinuora was 13-6-5 with 3 shutouts in 24 games for Denver and had a 2.35 goals against and .927 save percentage in his final season. The Pioneers tied for fourth in the WCHA and received an at-large bid to the NCAA tournament after falling to rival Colorado College in a three-game WCHA playoff series. Olkinuora stopped 35 of 39 shots in a 5-2 loss to New Hampshire in the NCAA Northeast Regional semifinals.
Olkinuora signed an entry-level contract with the Winnipeg Jets in April of 2013.