With Carrots and beets it is more a matter of planting time. Fall crops are usually done in the south. Planted in late August- September harvested in late fall early winter. Depending on how severe January weather is in your location, an early maturing cultivar may be better for fall planting. That is the case here for both spring and fall cool weather crops. Summers are just too hot for them to survive. In more northern locations, they can be planted in late spring and grow through the summer so a longer maturity date is possible.