It follows a successful trial across a number of sites in the in the north-east of the country earlier this month.
According to the bakery brand, a pilot project in the city's Tyneside area had 'progressed well'.
A Greggs spokeswoman said: “We have planned and delivered robust shop trials using our new operational safety measures and they have progressed well, allowing us to now move to open an increased number of our shops from mid-June.”
All reopened sites will be offering a slimmed-down menu that will include its vegan sausage roll, which boosted profits across the chain after it launched at the beginning of last year.
Greggs had initially set out a plan to have all 2,050 of the bakery chain’s UK branches open again by the beginning of July, beginning with 20 select locations in its hometown of Newcastle.
However, the chain subsequently backtracked on those plans over fears that sites could become overcrowded with customers.
Similarly to most UK operators, Greggs was forced to close its entire estate back in late March as a result of the Coronavirus pandemic.