You should have no problem growing butternuts at all unless we have a really bad summer if you give them what they want. Don't start them too early especially if you don't have a greenhouse and be prepared to pot on till they are quite tall and in big pots. I have grown some very long season squash in Yorkshire by doing this. Some buttternuts are faster to mature than others so check the seedsman for growing length.
They will not do well in a greenhouse unless it is very large as they really want some room.
There are many many squash with many different tastes, I have grown them for many years and have a big collection of seeds as most folks know.
You should be fine with decent growing conditions,
Up a sunny fence would be OK, be prepared to support them as they do not cling on like beans, also be careful as some butternurs are bush types and not vines so they would be useless on a fence.
Have fun
XX Jeannine
Oh to add ... the very best in my opinion are the Delicata family