One of the best tools that you have as gardeners to help us estimate your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

You will be able to figure out when it's the best time to plant bidens by reviewing the USDA zone info for Cortland.

Planting Calendar for Bidens

Frost tolerance for bidens:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Bidens do not do well in cold weather which tells us that it's necessary to wait until it warms up after the last frost when the weather gets warmer before you can plant them.

The earliest that you can plant bidens in Cortland is April. However, you really should wait until May if you don't want to take any chances.

The last month that you can plant bidens and expect a good harvest is probably August. Any later than that and your bidens may not have a chance to fully mature. You can get started a few weeks earlier by starting your bidens indoors.

Last Frost Date

On average all chance of frost has passed is on April 15 in Cortland. You should expect an average low temperature of -15°F in the coldest months of winter.

Since the USDA zone info for Cortland is an average the actual date of last frost can change quite a bit from year to year. Half of the time in Cortland it frosts late in the year after April 15 so make sure that you are ready to cover your bidens in the event of a surprise late frost.

USDA Zone Info for Cortland

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Cortland

You may be interested in your other planting guides for Cortland.