Signs of spring are latitude-dependent. Up here in the still-frozen north (a two-week stretch with daily high temps below freezing) we are still ankle-deep in snow with another 4" due tonight. My phenology calendar shows another week before we can expect the earliest robin to arrive.
But this morning our local Farm and Fleet had a newly-set-up and freshly-stocked rack of veggie seeds as a reminder that it won't be long...