All Hatch Charts
Bow River at Calgary
Southern Alberta · 4 active this month
Bow River at Calgary Hatch Calendar
Last reviewed 2026-05-21
World-class blue-ribbon reach. Full spectrum of mayfly, caddis, stonefly, and terrestrial hatches.
October hatches
Midge
Chironomidae
Moderatemedium
#18-263-12 mm
Air -5–25°C (optimal 5–18°C)Water 2–20°C (optimal 4–15°C)
World-class blue-ribbon reach. Full spectrum of mayfly, caddis, stonefly, and terrestrial hatches.
Blue-winged Olive
Baetis spp.
Highmedium
#18-225-7 mm
Air 8–18°C (optimal 10–16°C)Water 5–12°C (optimal 6–11°C)
World-class blue-ribbon reach. Full spectrum of mayfly, caddis, stonefly, and terrestrial hatches.
October Caddis
Limnephilidae
Highmedium
#8-1212-20 mm
Air 8–18°CWater 6–12°C
World-class blue-ribbon reach. Full spectrum of mayfly, caddis, stonefly, and terrestrial hatches.
No photo available
Sow Bug
Asellus
Highmedium
#16-206-10 mm
Air 10–28°CWater 8–22°C
World-class blue-ribbon reach. Full spectrum of mayfly, caddis, stonefly, and terrestrial hatches.