Incident light metering is the way to go to minimize risks of overexposure. You can subtract some 0.5 EV from the incident meter reading in order to have more of your scene further from the film's toe. Said in another way, your snow will be greyer, but with more overtones and undertones, and as your mind knows that the snow is white, you'll appreciate the greater texture while not bothering with the "un-whiteness" of the snow.
Be wary of scenes where you have half the snow in shade and half in full sunlight. The part in shade will have a blue cast if the sky is blue. If the sky is blue, and the scene is entirely in the shade, you will have the blue cast all over, which means it is easy to correct either during capture (with an amber* filter) or after capture if you print or scan.
* EDIT It goes without saying I mean one of those light amber filters sold as "skylight" filters.