Marin schools will not reopen for in-person instruction next month as planned, following orders from the governor last week that counties on the Covid-19 watch list must offer rigorous distance learning instead.

The change comes amid a summer of heavy planning by local school leaders operating under county guidance to bring students back to campus. Face coverings, physical distancing, symptom checks and bimonthly staff testing will still be required once schools reopen. But with teachers…