Steve Clarke's men were the confounded expectations throughout the campaign and Foster believes the Baggies can be happy with their season's work.
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|50/1||West Brom are 50/1 with William Hill to finish in the top four next season
"The gaffer told us after the game that it is the club's best season since the 1980-81 season.
"We should all be very proud of what we've achieved. We've been in the top half all season."
The stunning 5-5 draw with Manchester United on the final day - Sir Alex Ferguson's last game in charge of the club - coupled with Swansea's surprise 3-0 defeat to Fulham sealed the Baggies' place in the top eight, but Foster has already set his sights on kicking on again next season.
"We've got 49 points and that's great for a club of our stature," Foster added.
"We want to get to that 50-point barrier next season. We could have got it this year but it wasn’t to be."