Fresh salmon that was frozen after: till when can it still be eaten raw
As explained in How long can I store a food in the pantry, refrigerator, or freezer?, frozen food is safe indefinitely.

That being said, raw salmon that has simply been stored in your freezer for a while is not safe to consume without cooking. Not after 1 month, not after 1 week, not after 1 day. Fresh salmon needs to be cooked.

"Sashimi-grade fish" needs to be frozen at significantly lower temperatures than most home freezers are normally set at, and lower than many are actually capable of. Unless you can guarantee that it has been consistently lower than -20° C for 7 days or -35° C for 15 hours, you shouldn't eat it raw. Either buy sashimi-grade salmon from a reputable source, or order it prepared at a reputable restaurant.