The British Grands Prix at Silverstone will be held 2 and 9 August, followed immediately by the Spanish Grand Prix at Barcelona on 16 August.
The Belgian and Italian Grands Prix will complete the European part of the season on their original dates of 30 August and 6 September.
Plans for the remainder of the season were not announced, because of the uncertainty of the coronavirus situation in the various countries that would have made up the original schedule.
However, F1 said it had “an expectation of having a total of 15-18 races before we complete our season in December”.
It is understood that F1 is highly confident of finishing the championship with races in Bahrain on 6 December and Abu Dhabi on 13 December.
Before that, the low incidence of coronavirus in China, Vietnam and Japan makes races in those countries a strong probability in October.
The Russian Grand Prix, which is pencilled in for after the European events along with the race in Azerbaijan, and those in the US, Mexico and Brazil are more uncertain because of the high rates of infection in those countries.
F1 2020 opening calendar
3-5 July – Austrian Grand Prix (Red Bull Ring)
10-12 July – Steiermark Grand Prix (Red Bull Ring)
17-19 July – Hungarian Grand Prix (Hungaroring)
31 July-2 August – British Grand Prix (Silverstone)
7-9 August – 70th Anniversary Grand Prix (Silverstone)
14-16 August – Spanish Grand Prix
28-30 August – Belgian Grand Prix
4-6 September – Italian Grand Prix
Reverse grid proposal
F1 bosses have also proposed that some races run to a new format, with the grid for the main grand prix on Sunday decided by a shorter race on Saturday.
But this plan looks unlikely to happen because of opposition from Mercedes – any change to the rules after the start of a year in which a championship takes place requires the unanimous approval of teams.