Shops, hairdressers, gyms and outdoor hospitality will reopen on 12 April in England if strict conditions are met, under plans being set out by the PM.
Up to six people from separate households could be able to meet in beer gardens from that date.
The new four-step plan to ease lockdown could see all legal limits on social contact lifted by 21 June.
It requires four tests on vaccines, infection rates and new coronavirus variants to be met at each stage.
Prime Minister Boris Johnson told MPs the plan aimed to be "cautious but irreversible" and at every stage decisions would be led by "data not dates".
But he warned there was "no credible route to a zero-Covid Britain nor indeed a zero-Covid world".
It comes as the first data on the UK's coronavirus vaccine rollout suggests it is having a "spectacular" impact on stopping serious illness.
