At a glance: Westcot Apricot is an apricot tree rated hardy to zone 2b in our ratings (winters to -45°F), self-fertile, so one tree can crop (bloom group 2 of 7, early for an apricot), and it ripens about Jul 26 to Aug 5 in Missoula (picked and dated at our place in Missoula).
Hardy to
Zone 2b to 7. The b means the warmer half of zone