Before planting it is a good idea to find your USDA Zone info to figure out your garden schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The earliest that you can plant bidens in Marathon should be figured out by using the USDA zone info.

Planting Calendar for Bidens

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

Since bidens are not cold tolerant it's important to wait until after all chance of frost has passed before you can plant them.

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

The last month that you can plant bidens and expect a good harvest is probably November. If you wait 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

In Marathon it never frosts. In the coldest months of winter you should expect an average low temperature of 45°F.

Just be sure to remember that USDA zone info for Marathon is just an average and the actual date of last frost can change quite a bit from year to year. Since it never frosts in Marathon you do not have to be ready to protect your bidens if you have one of those late frosts.

USDA Zone Info for Marathon

Here is the info for USDA Zone 11b.

Average Date of Last Frost (spring)	Never
Average Date of First Frost (fall)	Never
Lowest Expected Low	45°F
Highest Expected Low	50°F

This means that on a really cold year, the coldest it will get is 45°F. On most years you should be prepared to experience lows near 50°F.

Plants to Grow in Marathon

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