Are there mosquitoes in Banff and Jasper? In July, on the trails and lakeshores.

Yes, for a few weeks. Mosquitoes come out on forested trails and the lower lakeshores from early July to about mid-August, and how wet June was decides how bad they get. The Banff and Jasper townsites have few, forum posters say, and the CDC recommends no vaccine or medicine against bug-borne disease for Canada.

July on the trails and lakes

Mosquitoes gather in damp forest and around lakeshores at lower elevations, and they tend to peak in late July. Lake Louise and Emerald Lake get them, and some guests in Lake Louise village say they couldn't sit outside in the evening. In Jasper, posters say Cavell Meadows and the Bald Hills and Opal Hills trails at Maligne Lake are buggy in their forested sections, while a breeze above treeline keeps mosquitoes off. Black flies, which bite by day near running water, can be fierce in hot spells, and hikers mention occasional pockets of horseflies up high.

The CDC's Canada page notes that bug bites in Canada "can still spread diseases," and for ticks and mosquitoes it recommends "a repellent that contains 20% or more DEET." Picaridin, oil of lemon eucalyptus and IR3535 also work against mosquitoes. Put it on before forest trails and lake walks, wear light long sleeves and trousers on buggy stretches, and take breaks in open, breezy spots. For multi-day trips such as the Skyline Trail, consider permethrin-treated clothing, which the CDC suggests for long stretches outdoors. Our picaridin vs. DEET comparison covers the choice.

June is shoulder season. High trails stay snowy until about early July, and the mosquitoes haven't started. By late August and September they have mostly gone.

Ticks in spring, and why disease is low

Ticks belong to spring. Low, dry trails in the Athabasca Valley near Jasper open from April, and that low-elevation hiking season, roughly April to June, is when ticks are most active on grassy slopes. A Jasper veterinarian told the local paper that most ticks there are wood and dog ticks, most active in spring. Health sources in neighboring British Columbia note that a wood tick left attached for several days can cause tick paralysis. On spring hikes, tuck trousers into socks, keep to the middle of trails through grass and shrubs, and check your whole body, your children and your dog afterward. Remove any attached tick promptly.

Lyme disease, Canada's main bite-borne illness, is mostly reported in Ontario, Nova Scotia and Quebec. Parks Canada's list of parks in the Public Health Agency of Canada's Lyme risk areas doesn't include Banff or Jasper, though it adds that ticks ride on birds, so "they can be found in areas across Canada." West Nile is rare in Alberta and tends to be a late-summer prairie concern more than a mountain one. A year-end report from Ontario's Thunder Bay District Health Unit counted 5 cases in the province in 2025, against 169 in Ontario. Canada has no malaria, dengue or Zika, and the CDC's one Canada-specific notice, for hepatitis A in Manitoba, has nothing to do with insects or the Rockies.

Where you're going

Here is how the main stops compare for a June–September trip.

The Canada briefing covers Ontario cottage country, Toronto, Montreal, Nova Scotia and Churchill, where June and July bite much harder.

What travelers report

Paraphrased from forum threads and reviews and linked so you can read them in full. None is dated, and how buggy a summer gets depends on how wet June was.

• Banff · July

  Replies said ticks are generally not a July concern (they are more common in the east end of Banff National Park and further east, and are waning by then). For mosquitoes, how wet June was makes a big difference, wet forested areas are worse than windy alpine ones, and exposed skin needs repellent; one poster saw no need to treat clothing while another had success spraying clothing in buggy areas. TripAdvisor ↗

• Moraine Lake · evening

  A visitor who came around 8 p.m. found the shoreline swarmed with mosquitoes and suggested visiting in the daytime instead. TripAdvisor ↗

• Skyline Trail, Jasper National Park

  A hiker who did the three-day trail praised the scenery but reported bloodthirsty mosquitoes, worst at the start and end of the trail, and strong wind on one section. TripAdvisor ↗

One rule outlasts the trip. Any fever during or after your trip means a doctor visit, and you tell the doctor where you hiked, and whether you removed a tick.

Traveler questions