Darius Henderson scored late on as Nottingham Forest claimed a first league win at Ewood Park since 1999.
Henderson's goal came in time added on after a frenetic game, when Blackburn goalkeeper Jake Kean failed to gather.
Jamie Mackie pounced on the loose ball and Henderson made no mistake with a carefully placed shot from 18 yards.
It is only the second time in 16 years that Forest have won back-to-back matches at the start of a season. But Blackburn are without a league victory.
The pace was frantic throughout but the game was bereft of clear-cut chances. One of Rovers' best came 10 minutes before the break when Jordan Rhodes met Alan Judge's curling free-kick but headed wide from 12 yards.
But Forest responded with a chance of their own before half-time, when Radoslaw Majewski released Henderson down the left. His cutback found the Polish midfielder and his 12-yard shot was destined for goal but for a fine headed clearance from Tommy Spurr.
After the break, Rovers were almost undone by the most basic of build-ups when a long clearance by Forest goalkeeper Karl Darlow was beautifully controlled by substitute Matt Derbyshire but the former Blackburn forward was thwarted by Grant Hanley.
But Forest would not be denied and snatched the victory when Mackie and Kean contested a long ball that the goalkeeper spilled. Mackie was alert and squared to Henderson, who hammered home.
Blackburn manager Gary Bowyer:
"It wasn't a classic of a game but I thought we showed fighting qualities and we pushed Forest as close as we possibly could.
"In my opinion, they're one of the favourites with the manager they've got and the money they've got, so we've got some positives to take.
"We haven't played as well as we can."
Nottingham Forest manager Billy Davies:
"We've still got to work around Darius Henderson and we know that. He's a player that can put in an outstanding performance and lead the line.
"It was a wonderful goal. It wasn't an easy ball to take. It was a very good finish.
"The second half was end-to-end, but overall you get what you deserve and I thought Henderson got what he deserved with his performance."
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