When I tried doing it, they willingly went up about 3 feet and then totally lost interest in my trellising project. Most of the C pepos want to stay on the ground, in my experience.

this year i threw all my old squash seeds in the ground. i do only vertical gardening. i had a squash vine that survived borers, had loads of vines on the fence but fruited late. they look like a very large delicata ( 10-12" yellow with green stripes cylinders) altho i don't remember buying them. now there is something boring tiny holes in them ! i haven't had this problem before. sometimes the squash exudes a thick clear gel through the hole. should i harvest now or hope no bugs are feasting inside ?!? i planted around june 5 and am in zone 6, southern Ct. the stems are not woody yet.

I agree with planatus, it is very hard to trellis squash (at least the ones I tried - pumpkins and butternut.) They grow through the trellis and back down again. The stems are brittle and are easily damaged or broken when attempting to force them up.

my fencing goes horizontal 7 feet up, i train the vines across it and
have fish net cradles for the fruit if they hang. i grow mainly
butternuts because of SVB. this system works for beans , tomatoes, and
sweet potatoes as i rotate crops.

not just C. pepos have long vines. i grow trombocino rampicante .. it's NOT a tasty winter butternut, but is rampant and prolific for summer squash. this year i have tahitian melon butternut for a winter squash. it looks almost exactly like the trombocino. it also is good as a summer squash ( no wasting those late fruits). and no SVB problems !

it is hard in the beginning to nudge young vines toward a fence and up. just be diligent in training the vines as they grow. wrapping the tendrils around the fence wire helps. if you hold them wrapped in place a minute, they take on the curve.

Delicata would not be a good climber. They sometimes go up and over other veggies in my garden but have never voluntarily climbed up much. They have no tendrils so you would have to provide support. My Maximas, on the other hand, have easily climbed to the top of my 8' cedar hedge. The vine on the left keeps is having problems only because the hedge's branches can't support the weight of that squash. But the tendrils themselves are plenty strong.

gee, my 'DELICATA' does have some tendrils. and it is bigger than i've read. now i am stumped ! whatever it is, i hope it's tasty.