The worst mosquitos ...ever, bar none were at Rosevelt National Park in North Dakota.... it was a 6. When we arrived I told them 2 nights ...the park ranger said no way... you won't want to stay... he was right ...we were in a tent and set up I lost a quart. There were clouds of them and buffaloes walking around you... we were on a motorcycle. We set up and hopped on the bike to out run them, found a bluff and stayed there drinking beer until night. Everybody should experience that... makes everything else seem relatively ok.