People coming to Jersey from the Ille-et-Vilaine region of Brittany, which includes St Malo, will now have to isolate for two weeks.
That's because it has been moved up to red on the government's traffic light system for safe travel.
Anyone who has stayed overnight in a red zone must quarantine for 14 days.
All but one department in France is now either amber or red. Only Creuse is green, which requires a PCR test but no isolation.
Amber regions require a Covid test on arrival and on day 5, with an exit from isolation allowed when the second test comes back negative.
Areas of Ireland, Germany and Italy have also been reclassified alongside France today.
Condor Ferries has told Channel 103 will review the frequency of its sailings to St Malo in line with demand.
The firm says it is too early to the impact the changes might have on services but it is monitoring the situation closely.
The changes are:
GREEN > AMBER
- Apulia, Italy
- Charente-Maritime, Nouvelle-Aquitaine, France
- Donegal, Republic of Ireland
- Friuli Venezia Giulia, Italy
- Hamburg, Germany
- Haute-Saône, Bourgogne, Franche-Comté, France
- Laois, Republic of Ireland
- Lot, Occitanie, France
- Meath, Republic of Ireland
- Orne, Normandie, France
- P.A., Bolzano, Italy
- Roscommon, Republic of Ireland
- Westmeath, Republic of Ireland
- Wicklow, Republic of Ireland
AMBER > GREEN
- Monaghan, Republic of Ireland
- Tipperary, Republic of Ireland
AMBER > RED
- Ain, Auvergne - Rhône - Alpes, France
- Ille et Vilaine, Bretagne, France
- Isère, Auvergne - Rhône - Alpes, France
- Loire, Auvergne - Rhône - Alpes, France
- Maine-et-Loire, Pays de la Loire, France
- Pas-de-Calais, Hauts-de-France, France
- Puy-de-Dôme, Auvergne - Rhône - Alpes, France
- Pyrénées-Atlantiques, Nouvelle-Aquitaine, France
- Pyrénées-Orientales, Occitanie, France
- Seine-et-Marne, Île-de-France, France
- Seine-Maritime, Normandie, France
- Tarn-et-Garonne, Occitanie, France
- Vienne, Nouvelle-Aquitaine, France
- Yvelines, Île-de-France, France
RED > AMBER
- Saint Barthelemy, France
The reclassification of regions across the UK, which was supposed to happen last week, is now due to happen later this week.
It was put off so work could be done on reducing the geographical area from a county to a local council level - because some counties, while designated as amber, had areas which would have been on green status.