I recently finished the 1st half of the CT and was taking some notes for myself, thought they might be helpful for others.
Gear:
– I caught a cold stretch, nights were low-30's-ish. Marmot hydrogen (30deg), tarptent contrail and ridgerest and it was *cold* at night. I consider myself a warm sleeper and was still wearing every piece of clothing (ex-rainwear) and fully mummied-up.
– ditch the water pump, iodine/chemical is fine.
– every day was warm enough for shorts/tshirt (or rainwear) even above treeline.
– I brought some lightweight gloves but would pass next time. never used them, even with a fair amount of rain.
– more than the freak snowstorm I think the scenario you should pack for is 2 full days of rain. a full day of rain at 11k feet can get pretty cold. Some others were using floorless tents and quite frankly I dont understand how they kept warm at night. This is not "get under a tree where its dry" rain – everything is soaked.
– A surprising number of people (myself included) managed to get blisters on the 1st day despite lots of loaded packing with the same footwear (in my case trail runners + light socks). I'd just pull my insoles before starting next time.
– warm clothing was just about right – lightweight thermal top, heavier thermal top, raincoat, polypro tshirt, ski hat. bottoms of thermals + rain pants.
– shorts/tshirt and all day hiking I used about 1/3 of an ouce of spf-30 sunscreen per day. no sunburns. I brought way too much.
Navigation:
– there are 4 main sources of trail nav {databook, guidebook, topos, gps waypoints from topo manufacturer}. The guidebook is too heavy to bring, the databook is very incomplete (frequently misses water sources etc, so you carry extra water when you dont need to). GPS+waypoints is total overkill – the trail is well marked almost everywhere, and if you get off just backtracking will get you in the right place. I think the best approach is to bring topos (the ones spiral bound) and the databook, and annotate your databook/maps with tidbits from the guidebook so you dont have to bring it. For example, phone numbers of lodging in towns you hope to stop in.
Other stuff:
– pretty much no bugs (early July). I brought 2 oz jar of deet and only put it on once, I'd pass on it next time.
– princeton hot springs (seg 13) is great, but you need a reservation if you want to stay.
– The trail passes close to some of the tenth mountain huts, they would be great places to stay. For example Janets cabin below Searles pass. They are not marked in the databook or topos, so maybe mark them and get the numbers into your cell so you can make reservation if things are lining up.
– I cached food along the way and was amazed to find that 1 of my bags was stolen (by humans) and another was taken down, rifled through, and re-hung. hide your bags from humans!
– fireside inn (hostel) at breck is nicely setup for backpackers, but spring for the non-shared room if you are lodging there. the bunks are like 4-feet long.
– waterton canyon (segment 1) is closing for like a year as they dredge out the sediment behind the dam. Make sure you know whats going on and if the trail is accessible.
– the nice ladies at the twin lakes store are selling iodine-taste-reduction tablets as iodine-tablets. I hope noone is buying them and not reading the labels!

