2020 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.
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Lillian Lake 7/2-7/5

Post by janky » Mon Jul 06, 2020 1:08 pm

Lillian Lake: 7/2 to 7/5

Mosquitoes were moderate during the day, very heavy at dawn and dusk. Mosquitoes present the entire hike to Lillian Lake on the Walton Trail and then on the way back using the Vanderburgh route they were only bad in a few spots.
Last edited by maverick on Mon Jul 06, 2020 1:38 pm, edited 1 time in total.
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Around Red & White Mountain, July 3-6

Post by Flamingo » Tue Jul 07, 2020 11:18 am

Overall, mosquito levels were lower than I expected. Light breezes kept it manageable. This is my first trip using Picardin-based repellent, and I think it works!

* Big McGee Lake: 2-3
* Tully Lake: 4
* Above Ross Finch Lake: 1-2
* Laurel Lake: 2 (with a breeze)
* Mono Creek, 2nd Recess Junction: 3, but 1 in the breeze.

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Northern Yosemite and Hoover July 3-7

Post by dougieb » Tue Jul 07, 2020 9:23 pm

Snow Lake 3 (pretty annoying at night)
lower Slide Canyon 3 during day (bad in shade, ok in sun)
Doe Lake 4-5 (unbearable at night)
Tallulah Lake during day only 2
Mule Pass area 0

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Glen Aulin TH Yosemite July 3 - 7, 2020

Post by genetastic » Wed Jul 08, 2020 10:13 pm

We did a 5 day loop via the Glen Aulin trailhead in Yosemite, north through Cold Canyon, west over Benson Pass to Smedberg Lake, south to Pate Valley, and back East through the Grand Canyon of the Tuolomne. Overall mosquitos were not bad except for the low elevations.

Cold Canyon north to the junction with Return Creek (~8700’): 1
Return Creek west over Benson Pass to Smedberg Lake (~9200’): 1
Smedberg south to Pate valley (~4300’): Mostly 1 until you hit the Tuolomne River where it hits 3
Pate Valley to Waterwheel falls (~6500’): 4 (hard to tell if they were small mosquitos or gnats/flies, didn’t really land but they would swarm us in every foresty section — the headnets were worth their small weight in gold)
Waterwheel falls to GA trailhead: 1

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Maxson>Portal>Finger>Reinstein>BCB 7/2-7/8

Post by MichaelRPetrick » Thu Jul 09, 2020 12:50 pm

Location: Maxson TH to Portal, to Finger Col, Finger Peak, then to Reinstein Pass, over Valor, back to Portal via Blackcap Basin Lakes, out Maxson.

1-2 everywhere except the swampy bits of Goddard Creek and some still lush spots either side of Maxson Meadow, where they were 3 enough to make me not want to stop hiking.

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Humphreys Basin and French Canyon 7/4-7/7

Post by papercup » Fri Jul 10, 2020 12:27 pm

2 most everywhere, including night one campsite near Marmot Lake and night three campsite at Lower Golden Trout Lake. Worse in the upper portions of French Canyon -- a 3 at our night two campsite near Paris and Puppet Lakes. Lower French Canyon and Hutchison Meadows were better.

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South Lake - Lake 10565 - Palisade Lakes - SoSHR - South Lake 7/2-7/5

Post by notis » Fri Jul 10, 2020 1:34 pm

2 during the day (light-to-moderate, esp. with wind). 3 in marshy/tarn/willowy/lake areas (heavy at night and in morning--eat with headnet in these areas).

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Pioneer Basin 7/10-11

Post by astrogerly » Sat Jul 11, 2020 4:23 pm

2 most of the time. We had a nice breeze/wind while in Pioneer Basin, so barely noticed them. Flared to a 2/3 when it was calm. Not bad at all and no complaints. Were the worst in the forest up to Pioneer Basin, but only if you stopped.

No bug issues from Mosquito Flat - Mono Pass - Golden Lake trail junction for reference too. It was toasty though!!

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Minarets July 9-12

Post by esrice » Tue Jul 14, 2020 1:15 pm

3, except in passes etc.

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Red Mountain Basin July 06-12

Post by grampy » Tue Jul 14, 2020 1:56 pm

“lollipop” circuit start/end Maxson TH:
2-3 through lower-elev. sections of trip; level 4 in boggy forest area just before (west of) Fleming Lake, also 4 (on my way out) in a broad area around Hobler Lake and Maxson Meadow. Few to none at Hell-for-Sure, Horseshoe, Blackrock Lakes.

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