Field notes · Calling moose with the wind

Calling moose: the bull circles for your wind.

A bull that answers rarely walks straight in. He works round to where he can smell the cow he heard, and that means downwind of the call. Set up for it and his circle brings him past the shooter. Set up against it and he winds you from cover and leaves.

Groundwind · 5 October 2026 · 6 min read

Why he circles

A rutting bull trusts his nose over his ears. Coming to a call, he swings to the downwind side to check it (Outdoor Canada), and he does it in cover: moose hurry across open ground rather than stand in it (Brown 2018). If he hangs up short of the call, two of the Alberta guides Outdoor Canada asked back off 50 to 75 m downwind and call again softly, so he thinks the cow is slipping away (Outdoor Canada).

It's what happened at our camp near White River on 27 September 2026. Through two and a half hours of cow calls a bull grunted on and off and drew the hunter off the calling spot toward him. When a last cow call set him going, he ran to get downwind.

Caller upwind, shooter downwind

Pick the wind for the spot

Read the spot by where you expect him to come from: browse, water, bedding cover.

• Best: the wind blowing from his side across you, 60 to 120° off his line, and on into ground he won't come from, like an open lake or a big bog you can see across.
• Fine: you straight downwind of his approach.
• A wasted sit: you upwind of his cover, with your scent blowing into it.

Then look hard at the downwind side, because that's where he'll circle. If it's open enough to see and shoot, good. If it's a wall of brush, he'll circle there unseen. As a rough guide you see about 80 m in open woods, 30 m in mature spruce and 5 m in a young thicket. Those are our estimates, from how a stand fills in and thins out as it grows (Oliver and Larson 1996).

Wind, calm and sound

• Calm and cold carries a call furthest. Depending on the wind, a bull can hear you from more than a kilometre and a half (Outdoor Canada).
• Wind eats your range. Our working numbers, not measured ones: full range under 10 km/h, about two thirds at 10 to 20, under half at 20 to 30, and little over 30. On a windy day, sit the lee slopes and the dense conifer, where hunters find them bedded.
• Heavy rain kills calling and the view. Light rain quietens the woods, which is good for still-hunting.
• A swinging wind sends the circle either way. If the wind swings more than about 30° through the sit, still-hunting may beat sitting.

The evening sit and the shore

Late in the day the air starts to drain downhill, and scent from the high ground runs down every gully to the water. In the rut, cows and calves gather near lakes, beaver ponds and marsh edges, and the bulls come to them. So the shore below you is the worst place for your scent to go. In the evening, sit low or level with where he'll come, across the slope. There's more on this in Hunting thermals.

Mornings from a point are the other way round: the land breeze takes your scent out over the water.

When to call

The rut runs from mid-September to late October across Canada, and callers agree the best of it is a two-week stretch at its peak (Outdoor Canada). In Ontario that's about 25 September to 5 October, around the breeding peak near 1 October. Bulls are a little more active by day than by night overall (Klassen and Rea 2008), but dawn and dusk are still the best hours, and a frosty morning is the best of those.