Blackstock had only been on the pitch for two minutes when he struck in the 80th minute to cancel out Ethan Ebanks-Landell's first-half opener
The draw brought to an end a run of four successive away defeats for Dougie Freedman's side - but ensured that Wolves woe at Molineux continued
Wolves have now failed to win any of their last five home games as Kenny Jackett's team struggle to get into the promotion picture despite putting together a five-match unbeaten run
Forest, who had arrived at Wolves on the back of three wins from four matches, made a sparkling start with Eric Lichaj heading narrowly wide after just two minutes following a knockdown from Matt Mills
Portuguese striker Nelson Oliveira then tested goalkeeper Carl Ikeme from 20 yards seven minutes later
Wolves managed to ride out the early storm and broke the deadlock in what was their first real threat on the Forest goal in the 15th minute
Jordan Graham whipped a left wing free-kick into a crowded Forest goalmouth and Ebanks-Landell came charging in at the far post to bury a powerful header beyond former Wolves goalkeeper Dorus De Vries
Forest responded positively to falling behind with Mills seeing a close range header well held by Ikeme
The visitors thought that had drawn level just four minutes after falling behind when Chris O'Grady tapped home a right-wing cross from Oliveira, only to see his effort ruled out for offside
Forest's plight would then have looked a whole lot worse after 36 minutes had it not been for the heroics of De Vries
He pulled off a stunning one handed save to deny Adam Le Fondre who had powered into the penalty area after charging down a clearance from former Wolves loanee Michael Mancienne.The hosts should have taken control of affairs 60 seconds before the interval when Le Fondre released the impressive Graham, only for him to fire his shot into the side-netting when he just had De Vries to beat at his near post
The imposing aerial presence of Ebanks-Landell was a major headache for Forest and it needed a goalline clearance from Mancienne to prevent him converting another header seven minutes into the second half
Ebanks-Landell again went close to scoring with a 75th minute header before Graham was denied by De Vries two minutes later
Successfully coming through that testing spell proved to be crucial for Forest as they were level when Wolves failed to deal with a Henri Lansbury corner and Blackstock ghosted in at the far post to volley past a stranded Ikeme
Source : PA
Source: PA