Bow River near Banff

Southern Alberta · 12 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.

July hatches

Salmonfly

Pteronarcys californica

Moderate-Highmedium

#4-830-50 mm

Air 14–28°CWater 10–16°C

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

Grasshopper

Acrididae

Moderate-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.

Brown Dun

Ameletus spp.

Moderatemedium

#14-1610-15 mm

Air 12–22°C (optimal 14–20°C)Water 8–14°C (optimal 9–13°C)

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

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.

Green Drake

Drunella grandis

Low-Moderatemedium

#10-1212-18 mm

Air 16–30°C (optimal 18–28°C)Water 14–20°C (optimal 15–19°C)

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

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

Pale Morning Dun

Ephemerella inermis

Highmedium

#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.

Golden Stonefly

Perlidae

Highmedium

#6-1025-40 mm

Air 16–30°CWater 12–18°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.

Highmedium

#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

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

Green Sedge

Rhyacophila spp.

Highmedium

#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.

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.

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