Bug Bite Forecast: Ontario — Week of June 29, 2026

The warm, clear evening will bring out hungry mosquitoes near Ramsey Lake, while deer flies may be a nuisance for those exploring trails around the city

Mosquitoes will be active around dusk, particularly near Kempenfelt Bay and in backyard gardens, but general activity should be manageable with repellent

Expect high mosquito activity near the many rivers and wetlands, with persistent deer flies and some lingering black flies a concern for hikers and campers in the surrounding wilderness

As the clear sky brings a pleasant evening, mosquitoes and tiny no-see-ums will emerge in parks and near residential green spaces, especially around stagnant water

High mosquito populations are expected along the St. Marys River and in wooded areas, with large horseflies a persistent

Expect moderate mosquito activity near the Ottawa River and in urban green spaces. Black flies may be present on trails in nearby Gatineau Park

Mosquitoes will be active, especially in areas bordering the Greenbelt or near local parks after dusk. Consider repellent for evening strolls

High risk of mosquito bites, particularly near the Mer Bleue Bog and other wetland areas in the Greenbelt. Deer flies may also be present

Moderate risk of mosquito and biting midge activity, especially along the waterfront of Lake Ontario and the St. Lawrence River. Enjoy outdoor patios but be prepared

Mosquitoes will be noticeable, particularly around Petrie Island and other areas close to the Ottawa River. Evening outdoor activities warrant insect repellent

Expect moderate mosquito activity, especially near the Rideau River and in residential areas with lush gardens. Patio dining could attract them

Mosquitoes will be active in wooded areas and local parks. Those exploring the Greenbelt trails should be mindful of black flies as well

High risk for mosquitoes and various biting flies, particularly near the Otonabee River and surrounding Kawartha Lakes. Outdoor adventurers should apply repellent generously

Moderate risk of mosquito and biting midge activity along the Bay of Quinte and Moira River. Evening walks by the water could be buggy

Expect moderate mosquito activity, especially near conservation areas and wooded trails. Ticks are also a concern in taller grasses

Mosquitoes and biting midges will be present, particularly near the St. Lawrence and Raisin Rivers. Evening outdoor events may require repellent

Moderate risk of mosquito bites, especially near the Trent River and Bay of Quinte. Deer flies may be active in more open, rural areas

Mosquitoes will be active, particularly around the Goulbourn Wetland Complex and other rural-urban interface areas. Black flies may also be present on trails

Expect moderate mosquito activity in local parks and residential areas with green spaces. Ticks could be a concern if venturing into overgrown areas

Low risk of widespread bug bites in this urban core, though mosquitoes may be present in small numbers near specific green spaces or after recent rain

High risk for mosquitoes and biting midges, especially near Lake Ontario beaches, vineyards, and wetland areas. Ticks are also active in tall grasses

Mosquitoes will be active in local parks and ravine areas. Evening activities in residential backyards may attract them

Expect moderate mosquito activity, particularly near Lynde Creek and the rural edges of town. Some deer flies might be present in open, sunny areas

Mosquitoes will be active, especially in residential areas with mature trees and near the Rideau River. Evening gardening could attract bites

Moderate risk of mosquito bites in wooded residential areas and local trails. Black flies may also be encountered deeper in forested sections

Mosquitoes and biting midges will be present, particularly along the St. Lawrence River and in the 1000 Islands region. Enjoy waterside activities with caution

High risk for mosquitoes, black flies, and deer flies, especially given its "Trail Capital" status and numerous forested areas. Ticks are also a significant concern

High risk of mosquito and black fly activity, especially near the Ottawa River and in the surrounding rural, wooded areas. Repellent is highly recommended for outdoor time

High risk for mosquitoes, deer flies, and horse flies, particularly around the Scugog River and the Kawartha Lakes. Fishing and hiking will require strong protection

High risk of intense mosquito, black fly, and deer fly activity in this heavily forested and lake-filled Muskoka region. Prepare for persistent biting insects during any outdoor venture

Mosquitoes will be active, especially near the Credit River trails and Lake Ontario parks. Enjoy patio dining but consider repellent in the evening

Expect active mosquitoes in local parks and along the Etobicoke Creek. Evening strolls or backyard activities may attract bites

High mosquito and black fly activity is expected along the Escarpment trails and near Cootes Paradise. Protect yourself if hiking or spending time near wetlands

Mosquitoes will be prevalent near

With warm temperatures and moderate humidity, mosquitoes will be active near residential green spaces and the Black Creek ravine. Evening strolls or gardening could lead to several bites

High Park’s varied terrain, from dense woods to ponds, creates ideal conditions for mosquitoes and ticks. Hikers and picnickers should take precautions, especially in shaded areas and tall grass

Mosquitoes will be prevalent in this suburban area, particularly near the Mimico Creek and local parklands. Expect moderate activity during evening outdoor gatherings and playdates

The warm, humid conditions combined with proximity to Lake Erie and agricultural fields will lead to high mosquito and midge activity. Waterfront diners and those near fields should prepare for numerous bites

Mosquitoes will be active along the Humber River greenbelt and in residential backyards. Cyclists and dog walkers on local trails should anticipate moderate biting insect encounters

While warm, the dense urban environment and breezes off Lake Ontario will keep biting insect activity relatively low. Mosquitoes may still be present in shaded park corners, but widespread annoyance is unlikely

The Black Creek ravine system provides ideal breeding grounds for mosquitoes and black flies, making activity high. Visitors exploring the trails or the Pioneer Village should use strong repellent

Mosquitoes will be active in residential backyards and small community parks, particularly in the evening. Outdoor dining and gardening activities may result in several bites

The Grand River and surrounding conservation areas create prime conditions for high mosquito and black fly activity. Anglers, campers, and hikers should be prepared for persistent biting throughout the day and evening

Expect moderate mosquito activity in residential areas and local parks, especially as evening approaches. Those near agricultural fields might also encounter deer flies

Mosquitoes will be active, especially near the numerous city parks and ravines during evening strolls. Waterfront areas might offer a slight breeze, but still warrant repellent

Expect moderate mosquito activity in backyard gardens and local conservation areas; evening patio dining may attract unwanted guests

High mosquito activity is likely, particularly along the Oshawa Creek trails and near Lake Ontario’s shoreline as evening approaches. Outdoor gatherings should prepare for biting insects

Mosquitoes will