Jersey will reclassify all of England as red from June 29, because of increasing cases of the Delta variant.
Scotland was already red but Wales and Northern Ireland remain green.
Red classifications require all passengers to self-isolate for a minimum of 10 days on arrival into Jersey, unless they have been fully vaccinated or are under the age of 18.
They must receive negative test results from day 0, day 5 and day 10 tests. Those who have been fully vaccinated only have to isolate until their first negative test result, and will take a second test on day eight.
Arrivals from green areas must have a test on arrival, but do not have to isolate.
A week before all of England is added to the red list, an ‘emergency brake’ will be placed on 49 English areas, meaning they will be classified as red from June 22.
Jersey’s chief minister, Senator John Le Fondré, said: “Our Safer Travel Policy continues to try to balance the need of connectivity to the island and managing public health risk.
“The changes ministers are implementing to the policy come as cases of the Delta variant in the UK continue to rise.
“Scotland has already passed the red threshold and currently has a 14-day infection rate of more than 200. England has now also passed the red threshold, with a 14-day infection rate of more than 130.
“I understand the challenges that a red classification for England may bring to many who were planning to travel to the Island over the coming weeks, but we must continue to assess the infection rates and take the necessary action to ensure Jersey remains a safe place to live and to visit.
“England’s red classification will be implemented from Tuesday 29 June to ensure returning islanders and visitors to Jersey have time to make relevant revisions to their travel plans.
“We feel that this will minimise disruption, providing adequate time for arrangements to be made, while continuing to balance the risk of England’s increasing infection rates.
Travellers still need to declare their 14-day travel history when completing their pre-departure forms, and all arriving passengers are advised to check the up-to-date classifications of where they have stayed in the past 14 nights.