Most of us reading this newspaper reside in the third or fourth hardiness zones. It depends on the map you consult and to a lesser degree where Canada is located as you view the chart. Suffice it to say the optimum time to plant hardy bulbs is from mid-September into early October. Anytime the average soil temperature drops below 60 degrees F. Try to get them in before the ground freezes solid, hence the cutoff time of early October. Bulbs bloom throughout the year, with crocuses popping up through the snow followed by irises, hyacinths, tulips, and so on.
Crocuses end the season, too, with the saffron variety.
So make one. It only has to be an idea of where bulbs are planted, but can be a very accurate document. As the bed matures, you will be able to determine which bulbs need to be replaced each fall. Planning your planting is too extensive a subject to be covered here. I emphasize free only because you might be enticed into spending a small fortune to duplicate the color pages in the catalog.