I had a client ask me last week if it was too late to plant bulbs. The short answer is “No,” you can plant right up until the ground freezes.
Depending on if you have issues with deer and rabbits nibbling your spring bulbs, you may want to stick with Crocus, Narcissi and alliums to prevent losing your hard work to 4-legged nibblers. If you have problems with chipmunks and/or squirrels digging up your bulbs for breakfast, you can try sprinkling bobcat urine in with your bulb booster when you’re placing the bulbs in the hole, and another light coating on top of the soil when you cover them over. If they are REALLY persistent about digging up your bulbs, my Mom used to put her bulbs in small wire cages to prevent the rodents from eating them.
So it’s not too late to plan for that early pop of color in the Spring!