I live in Sacramento and fish all the time here and north. No, I don't think it would be worth it to come in February. Fishing is at best fair, there is no globugging to speak of anywhere this year due to the poor salmon run (and certainly not for the miserable return of winter run), and it is no better (probably not as good) in Redding compared to Sacramento. At least in Sacramento, we can poke around the American for hatchery fish; and go an hour north to the Yuba (there are sometimes skwala's, some years, but again - flow/clarity/weather factors).
The upper Sac can be good but it usually isn't in February.
A shot in the dark might be the smaller coastal streams, west of here (gualala, garcia, navarro, not the russian, some others); and some are gaged; but sheet, it's not something I would plan a trip on.
Go ahead, check fishfirst.com; the redding fly shop (theflyshop.com); and get the scoop.