O 15 Chwefror ymlaen, cyflwynodd Llywodraeth Cymru waharddiad ar deithwyr sy’n cyrraedd Cymru os ydynt wedi bod i wlad ar y rhestr goch yn y 10 diwrnod blaenorol. Rhaid iddynt gyrraedd yn un o’r pyrth mynediad dynodedig yn Lloegr (neu’r Alban) ac aros yno o dan drefniant ynysu wedi’i drefnu am 10 diwrnod cyn teithio i Gymru. Golyga hyn na chaiff teithwyr o’r fath ddod i Gymru (heblaw am eithriadau cyfyngedig iawn) a bydd dod i Gymru yn groes i’r ddarpariaeth honno yn drosedd, gyda Hysbysiad Cosb Benodedig o £10,000.
From 15 February the Welsh Government introduced a ban on travellers arriving into Wales if they had been in a red list country in the previous 10 days.  They must arrive at one of the designated ports of entry in England (or Scotland) and remain there in managed isolation for 10 days before travelling on to Wales.  This means that such arrivals are not allowed entry in to Wales (except very limited exemptions) and to enter contrary to that provision will be a criminal offence with a Fixed Penalty Notice (FPN) of £10,000.