[Lardman]

How can I tell when to harvest them?

They've been orange for weeks which seemed somewhat early for a winter squash, I don't want to leave them out there to rot are they really finished already?

[Beetroot Queen]

No idea hubby harvested some that are not ready but most of my squash are still classed as unidentified as they dont match the pictures

[mumofstig]

Have the stem handles started to split/look corky yet - that's when it's ripe 

[Lardman]

Have the stem handles started to split/look corky yet - that's when it's ripe 

I'll have a look in the 'morrow. I noticed 2 more of the spaghetti squash had dropped off  decent size fruit too  - Im not sure if it's the weather conditions or the soil but all the squash plants are looking decidedly sickly.

[Lardman]

Fruit and leaves. Im not sure the plant has much life left in it.

[New shoot]

It does look like the plant is giving up for the season, but as long as it here is no frost risk or extended periods of rain, you could leave the fruit to ripen and harden the skin more for storage.

I've cut squash before and laid them out on the greenhouse staging to get the skins to really cure properly.  Could be an option if the weather turns suddenly