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Bow River near Banff

Southern Alberta · 8 active this month

Bow River near Banff Hatch Calendar

Last reviewed 2026-05-21

Glacial influence — hatches run 1–2 weeks later than Calgary reach. BWOs and midges primary early season.

August hatches

No photo available

Pale Morning Dun

Ephemerella inermis

Moderatemedium
#16-188-12 mm
Air 14–28°C (optimal 16–26°C)Water 12–18°C (optimal 13–17°C)

Glacial influence — hatches run 1–2 weeks later than Calgary reach. BWOs and midges primary early season.

No photo available

Yellow Sally

Isoperla spp.

Moderatemedium
#14-168-12 mm
Air 16–32°CWater 12–20°C

Glacial influence — hatches run 1–2 weeks later than Calgary reach. BWOs and midges primary early season.

No photo available

Green Sedge

Rhyacophila spp.

Moderatemedium
#14-168-14 mm
Air 14–28°CWater 10–18°C

Glacial influence — hatches run 1–2 weeks later than Calgary reach. BWOs and midges primary early season.

Flying Ant

Flying Ant

Formicidae

Moderatemedium
#16-204-8 mm
Air 15–35°C (optimal 20–30°C)Water 10–22°C

Glacial influence — hatches run 1–2 weeks later than Calgary reach. BWOs and midges primary early season.

Midge

Midge

Chironomidae

Highmedium
#18-263-12 mm
Air -5–25°C (optimal 5–18°C)Water 2–20°C (optimal 4–15°C)

Glacial influence — hatches run 1–2 weeks later than Calgary reach. BWOs and midges primary early season.

No photo available

Spotted Sedge

Hydropsyche spp.

Highmedium
#14-188-14 mm
Air 16–30°CWater 12–20°C

Glacial influence — hatches run 1–2 weeks later than Calgary reach. BWOs and midges primary early season.

No photo available

Trico

Tricorythodes spp.

Highmedium
#20-244-6 mm
Air 16–30°C (optimal 18–28°C)Water 14–22°C (optimal 15–21°C)

Glacial influence — hatches run 1–2 weeks later than Calgary reach. BWOs and midges primary early season.

Grasshopper

Grasshopper

Acrididae

Highmedium
#8-1215-35 mm
Air 15–35°C (optimal 20–30°C)Water 10–22°C

Glacial influence — hatches run 1–2 weeks later than Calgary reach. BWOs and midges primary early season.

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