Crane took advantage of a 3 1/2-hour delay that left nearly perfect scoring conditions with no wind and rain-softened greens. He had five of his seven birdies on his final nine holes, the last a few minutes before play was suspended because of darkness.
Crane needed only 24 putts for his best round of the season.
Sixty players were unable to finish the round.
Peter Malnati shot a 65, and Billy Horschel also was at five under with two holes left to play.
Michelle Wie and defending champion Hee Young Park shared the first-round lead at six-under 65 in the
Wie, the winner in Hawaii in April, birdied three of the last four holes in her morning round. She's seeking her second victory in Canada after winning the 2010 Canadian Women's Open in Winnipeg, Canada.
Park had a bogey-free round in the afternoon. Last year, the South Korean player beat Angela Stanford on the third playoff hole after they finished at 26-under 258 to match the tour record for lowest total score.
China's Shanshan Feng was a stroke back, and countrywoman Xi Yu Lin matched Cristie Kerr with a 67.
Stacy Lewis had a 69 in her first round since taking the top spot in the world with a victory Sunday in New Jersey. Second-ranked Inbee Park also shot 69, and No. 3 Lydia Ko had a 71.
England's Adam Gee and Sweden's Mikael Lundberg shot five-under 67 in windy conditions to share the first-round lead in the Lyoness Open in Atzenbrugg, Austria.
American Berry Henson was a stroke back along with Wales'