How do you grow butternut squash in a small room?

Online Answer
If space isn't on your side, then growing squashes upwards is the obvious answer. The easiest way is to train them onto trellis. A simple one-piece trellis can be secured against a sun-facing wall or strong fence. Plant your squashes the same distance apart that they would grow at if left at ground level.
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This may be the result of a squash vine borer (SVB), which is a type of moth that lays its eggs at the base of squash plants. When the eggs hatch, the larvae burrow (or "bore") into the lower stems, weakening or killing the plant outright. ... If caught early, it's possible to save the plant..