What helped Riverdale was their Netflix deal. All episodes go on that. So summer allowed for a spike in viewership and interest.

Now onto Roswell news. It's not playing in the fall. It's being held to mid-season. Which tells me it was not strong enough to play in the fall...

Charmed gets the fall slot on Sundays with Supergirl.

Now it might mean Roswell will be fine. But debuting in mid-season doesn't speak as strongly for it.

We shall see....

Jane, Crazy Ex-girlfriend and iZombie are CONFIRMED to be ending next year. So if Roswell does get some decent numbers, it will probably will be renewed. But we shall see...

the FALL schedule...

Source: tvline.com