It depends upon where you are. On the US west coast, the vernal equinox (according to timeanddate.com) is Thursday, March 19, 2020 at 8:49 pm PDT, and on the east coast at 11:49 pm EDT. But in Perth, Australia, for example, it occurs Friday, March 20, 2020 at 11:49 am AWST. So you really need to check the date and time for your ride route (all times are local).
Ira