frost will not harm your harvest...yes, a hard frost will kill the plant and means it's time to bring it in beyond all doubt but still nothing to fear. a light frost will kill off the tips and those can be harvested but the rest of the plant will keep ripening...especially once it warms up again like it's doing now! but once damage has been done the damaged parts will not recover...and cooler temps (below 40) tends to make many strains turn purple-ish.