2008-09: Pheonix Copley skated for the U18 Arctic Lions in Fairbanks along with his older brother Navarone Copley.
2009-10: Copley played for the U18 California Titans — splitting the goaltending duties with Gordon Ceasar. In 10 regular season games he was 6-1 with one shutout and had a 2.62 goals against and .871save percentage.
2010-11: Copley attended camp with the Corpus Christi IceRays of the NAHL and earned the starting goaltender spot. He played in 42 of 48 games for Corpus Christi. Copley was 14-23-4 with a 4.17 goals against and .880 save percentage on an IceRays team that missed the playoffs after finishing fifth in the South Division.
2011-12: Copley began his first USHL season with the Tri-City Storm and in November he committed to playing college hockey at Michigan Tech in 2012-13. He was obtained by the Des Moines Buccaneers in exchange for goalie Christian Frey in a February trade. Splitting the goaltending duties with 2011 Tampa Bay draft pick Adam Wilcox, Copley appeared in 25 games for the Storm and was 9-13 with a 3.14 goals against and .905 save percentage. He played in 20 games for Des Moines following the trade and was 7-11-1 with a 3.09 goals against and .909 save percentage. The Buccaneers missed the playoffs after finishing seventh behind Tri-City in the Western Conference.
2012-13: Copley burst onto the college scene — making 70 saves in two games in back-to-back 4-0 shutouts over Western Michigan and Michigan at the Great Lakes Invitational and being named the tournament's Most Valuable Player — as a freshman for Michigan Tech. In 24 games he was 8-15-1 with a 3.22 goals against and .900 save percentage. The Huskies finished tenth in the WCHA. Copley stopped 29 shots against North Dakota in a 2-1 win to force a Game 3 in their first round WCHA series and was in net the next night as the Fighting Sioux scored six goals on 44 shots in a 6-0 win.
2013-14: Copley joined the ECHL's South Carolina Stingrays for their playoff run after signing an NHL contract with Washington following his sophomore season at Michigan Tech. The Capitals signed Copley to a two-year entry-level contract on March 19th, 2014. Copley made his first pro appearance on April 2nd, stopping 10 of 12 shots in relief of starter Allen York (including all three shootout attempts) to get credit for the win in the Stingrays 6-5 win over Florida. South Carolina was the top team in the South Division. Copley was 10-13-6 with one shutout in 30 games for Michigan Tech in his final college season. The Huskies finished fifth in the re-aligned WCHA and lost to Bowling Green in a two-game quarterfinal series.
The Capitals signed Copley to a two-year entry-level contract on March 19th, 2014.