Unless you get a killer frost between now and then, OY, you should be alright.
But keep in mind that one virtue of winter squashes is their keeping ability. Depending on variety and storage method, some of them will keep well into next spring. So, if you pick it now and keep it indoors or on the porch, there's no question it will still be prime when Halloween rolls around.
As a general rule, the sweeter the squash the shorter it will keep. But that's relative. Even the sweetest squashes should store well for a matter of months. | 
