Alas, here at the base of Mt. Chocorua is a highly tick infested area in what has become the Lyme disease capitol of the US.
So I have been using permethrin on my clothing for years, and it is very effective, especially around the socks and pant legs. However, bushwacking exposes the upper body to places where ticks lie in wait, so no more bushwacking. What were bushwacking routes are now winter snowshoe routes only.
Do not use the stuff on my dogs for heaven's sake, who have been innoculated for lyme disease. If only the vaccine for humans had been perfected rather than pulled off the market.
I've found for many years that the Permethrin must be resprayed every hike to be effective. If not, ticks come home with us every time.
During a warm wet spell, we had a profusion of deer tick nymphs last OCTOBER! About half the ticks tested in NH turn up lyme positive. So, they are an increasingly serious problem. There is no point in moving, because every year the deer ticks move further north.
So we stick to the hardened trails in the three warmer seasons. And do more BP in northern Maine, now. The northern section of the Cohos trail is still OK, but don't know how long that will be the case. Quite a change from just a few years ago.
One concern is that I noticed that this year, Walmart and many local chains pulled the Permethrin from their shelves without explanation, and it is becoming more difficult to purchase. It would be useful to know more about toxicity of this stuff.