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2018 Mosquito Reports

Questions and reports related to Sierra Nevada current and forecast conditions, as well as general precautions and safety information. Trail conditions, fire/smoke reports, mosquito reports, weather and snow conditions, stream crossing information, and more.

Mineral King 6/1-6/3

Postby jhfowler » Mon Jun 04, 2018 8:49 pm

Mineral King Loop 6/1 - 6/3, full report here:


Zero mosquitoes anywhere.
Last edited by maverick on Tue Jun 05, 2018 10:26 am, edited 1 time in total.
Reason: Title change

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Tioga Pass 5/29-6/1

Postby marymaryland » Wed Jun 06, 2018 3:02 pm

1. Very few mosquitos on the pass in the mornings (~0600-1000).
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Big Whitney & Tunnel Meadows 6/8

Postby Dmasten » Fri Jun 08, 2018 8:35 pm

Sounded like a couple of mosquitos at Horseshoe Meadows TH around 8:00 AM, but no bites. No other mosquitos until late afternoon just below Trail Pass, then just a few, but biting, so 2.
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Ebbetts Pass area 6/10

Postby scraperpro » Sun Jun 10, 2018 7:48 pm

PCT around Ebbetts Pass/Noble Canyon dayhike -- 0 mosquitos
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Little Yosemite Valley June 9th

Postby davidsheridan » Tue Jun 12, 2018 8:35 am

Little Yosemite Valley - June 9th

2 Rating - the mosquitoes were present throughout the day, but they were not biting aggressively. A little deet and some nice breezes made it so it was not an issue.
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Loch Leven Lakes + Snow Mountain 6/8–6/10

Postby mister_e » Tue Jun 12, 2018 5:11 pm

6/8 — 1. Night hike a couple of miles up the Loch Leven trail; encountered no mosquitoes
6/9 — 2. While breaking camp we saw a few mosquitoes, and at least one attempted a bite through my left Vibram Fivefingers (unsuccessful). Did not see any once we reached the altitude of the lakes (6800 ft); nor when we descended off-trail into the Big Granite Creek valley and stopped by the creek for lunch (5900 ft); nor when we climbed Snow Mountain or camped on the ridge behind it (7500 ft).
6/10 — 1. Woke with frost on tarp and found the damp ground slightly frozen compared to the night before; descended fire road and returned to Lakes cross-country and then to trailhead without seeing any further mosquitoes.
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Yose Cathedral to Valley 6/10-6/12

Postby maiathebee » Wed Jun 13, 2018 12:29 am

6/9 - Tuolumne Meadows 2
6/10 - Cathedral Lakes 2, Long Meadow 4, ridge above Sunrise Lakes HSC 1
6/11 - Sunrise Lakes 2, Clouds Rest 0, Echo Creek 2
6/12 - Merced / LYV / Valley 2
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Courtright Reservoir/Dinkey, 6/10

Postby AlmostThere » Wed Jun 13, 2018 6:39 am


The meadows are drying out fast. But there are the usual pools here and there, to breed them.... Nights are still freezing, but anticipate the onslaught is about to hit.
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6/3-6/5 Crabtree TH -> Cherry Creek (West Fork)

Postby watsonic » Wed Jun 13, 2018 3:48 pm

2 on most of the trip, with breaks from them up in the Pingree / Leighton lakes area (~8K-8300). Never really got above 2, even in the flooded Groundhog Meadow area.
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120 Corridor Thru Yosemite to Mono Lake 6/10-6/13

Postby SSSdave » Wed Jun 13, 2018 5:30 pm

Three days along SR120 through Yosemite and down at Mono Lake. Mostly 1 or 2 however very location dependent. Wet marshy lush and stream areas could be 3 while sunny dry areas 1. 3 bit my back through a cotton t-shirt eating at a Tenaya Lake table. Same situation at Lembert Dome, a couple made passes at me. I will speculate that our 4 year drought seriously reduced populations of snow mosquitoes that have not yet recovered. That is possibly why we haven't seen bad mosquitoes since 2010 despite the last couple winters being wetter.
Last edited by maverick on Wed Jun 13, 2018 6:18 pm, edited 2 times in total.
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