The dampness issue in the PNW is a big one. In the past we've had bees winter over fine, then when you get warmer days in early spring, if there's too much moisture in the hive, fungus and molds can get a hold. We're finding that lifting the hives up 30" off the ground makes a BIG difference. The dampness is in the ground and bees by choice wouldn't put a hive that close to the ground.
I tell all my beekeeper friends to raise their hives up. Make them secure because we can get some stiff winds. Best idea of all is a bee shelter -- a raised shelf under the hives (you can hold more than one hive on it) and a roof over it. In cold rainy seasons the roof keeps rain off and when the roof is high enough, it still allows the winter sun to reach the hives to warm them. In summer the overhead roof will block sun and let them stay cooler when it's hot out.
Second best idea is to put them on an open raised shelf of some kind. We have two of ours on an old picnic table and they're doing very well.
This is really important -- be SURE to tie the hives down. We've had stray gusts in our valley that twice have knocked a hive over. Now we anchor them securely to the ground so they absolutely can't tip over. There's nothing worse than finding a perfectly functioning hive tipped over with comb in chaos. The bees can never get it back together the neat way they've had it and that's just plain human error. I hope anyone with bees who hasn't anchored them down learns from my mistakes!
We have another hive on a metal table I found at the recyclers. It weighs about 300 lbs and I feel good having a top bar hive on that, tied securely to it. When I want to open the hive (which isn't often), I untie the ropes.
warmly,
Jacqueline Freeman
Friendly Haven Rise Farm
www.friendlyhaven.com Venersborg, WA (near Portland)