Alaska’s most infamous bugs are its mosquitoes, which emerge in enormous swarms every summer and can make outdoor life genuinely miserable from late May through July. But mosquitoes aren’t the only insects worth knowing about. The state also hosts white-sox blackflies, no-see-ums, and a spruce bark beetle that has reshaped millions of acres of forest. The good news: Alaska has almost no ticks, and the diseases they carry elsewhere in the U.S. have never been contracted within the state.
Mosquitoes: Alaska’s Unofficial State Bird
Alaska is home to roughly 35 mosquito species, and they dominate the bug conversation for good reason. The sheer volume of standing water across the state, from tundra ponds to boreal bogs, creates ideal breeding habitat on a massive scale. The first species to appear each spring is the snow mosquito, the largest mosquito in Alaska. It overwinters as an adult beneath the snow, tucked into leaf litter, loose tree bark, or dead stumps, and emerges from mid to late April while snow is still on the ground.
The snow mosquitoes are big but relatively slow. The real misery starts a few weeks later when smaller, more aggressive species hatch. The majority of Alaska’s mosquitoes spend winter not as adults but as eggs, deposited by females in late summer into the specific habitats where larvae will develop the following year. Once temperatures warm and snowmelt fills those habitats, the eggs hatch almost simultaneously, producing the dense swarms Alaska is known for.
Peak mosquito season runs roughly from late May through mid-July, with June typically being the worst month. Interior Alaska and the Arctic tundra experience the heaviest concentrations because the flat, poorly drained terrain holds water everywhere. Southeast Alaska, with its cooler coastal climate and better drainage, tends to have fewer mosquitoes but more rain. By August, mosquito numbers drop noticeably across most of the state, and by September they’re largely gone.
Blackflies and No-See-Ums
Mosquitoes get the headlines, but blackflies (also called white-sox) are a close second in terms of annoyance. They’re smaller than mosquitoes, don’t buzz as loudly, and tend to bite around the hairline, ears, and neck. Unlike mosquitoes, which pierce the skin with a needle-like mouthpart, blackflies cut the skin and lap up blood, which makes their bites more painful and more likely to swell. They’re most active during the day, especially near running water where they breed.
No-see-ums, tiny biting midges barely visible to the naked eye, round out the trio. They’re most common near coastal areas and wetlands and can slip through standard window screens and mosquito netting. Their bites produce itchy welts out of proportion to their size. Like blackflies, they peak in June and July and prefer calm, warm days.
Spruce Bark Beetles
Alaska’s most destructive insect isn’t one that bites people. The spruce bark beetle has killed trees across enormous stretches of forest, reshaping landscapes visible from the air. Southcentral Alaska has been experiencing an outbreak since around 2016 that has impacted at least 1.6 million acres, according to the Alaska Division of Forestry and Fire Protection.
During normal population levels, spruce beetles target large, wind-thrown, or already damaged trees. But when populations surge, typically driven by consecutive warm summers that speed up the beetles’ life cycle, they overwhelm the defenses of healthy spruce and cause widespread die-offs. The dead, gray-needled forests across the Kenai Peninsula are one of the most visible results. These outbreaks also increase wildfire risk by leaving behind standing dead timber.
What Alaska Doesn’t Have
One of Alaska’s genuine advantages is its near-complete absence of ticks. The state’s winters are too harsh for the tick species that carry Lyme disease and Rocky Mountain spotted fever to establish breeding populations. According to the Alaska Department of Health, every case of Lyme disease reported in Alaska residents has been traced to travel outside the state. No one has contracted it within Alaska’s borders.
Alaska also lacks many of the venomous insects and arachnids found in the lower 48. There are no fire ants, no brown recluse spiders, no scorpions. Wasps and yellowjackets do exist but are far less common than in temperate states. If you’re coming from an area where tick checks are routine and fire ants are a yard hazard, Alaska’s bug profile is actually simpler, just more intense during its narrow summer window.
How to Protect Yourself
DEET remains the most effective topical repellent for Alaska’s biting insects. Concentrations of 30 to 40 percent provide strong protection for most situations. The jump in effectiveness from 0 to 40 percent DEET is dramatic, but above that the gains are small. For multi-day backcountry trips in heavy bug territory, 95 to 100 percent DEET offers near-complete protection, though concentrations that high should never be used on small children.
Permethrin-treated clothing is the other major tool. You can buy pre-treated shirts, pants, and hats from outdoor retailers, and the treatment lasts up to 70 washes. You can also buy permethrin spray and treat your own gear. Unlike DEET, which goes on skin, permethrin goes on fabric and kills or repels insects on contact. Combining DEET on exposed skin with permethrin on clothing is the most effective layered approach.
A mesh headnet is worth packing for any backcountry trip, especially in June. It weighs almost nothing, and when mosquitoes are thick enough to cloud your vision, nothing else provides the same relief. Long sleeves, long pants, and light-colored clothing (which attracts fewer mosquitoes than dark colors) round out the basics. For camping, make sure your tent has intact no-see-um mesh, not just standard mosquito netting, since the smallest biting midges can slip through larger mesh openings.
Timing Your Trip Around the Bugs
If avoiding bugs is a priority, the best windows are early May (before the main hatch) and mid-August through September (after populations crash). Late June is the absolute peak in most regions. That said, June and July also bring the longest daylight, the best wildflower displays, and prime fishing, so most visitors accept the bugs as part of the deal.
Elevation and wind help. Mosquitoes are worst in sheltered, low-lying areas near standing water. Ridgelines, glacial areas, and exposed coastline with steady wind tend to be far more pleasant. If you’re choosing between two campsites, pick the one with a breeze.