Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

The USDA zone info for Eugene should be read to estimate when to plant bidens.

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 you really should wait until after the last frost has passed before you can plant them.

The earliest that you can plant bidens in Eugene 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. If you wait any later than that and your bidens may not have a chance to fully mature. You can get started a little bit earlier by starting your bidens indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on March 15 in Eugene. It might get as low as 15°F during the coldest months of winter.

Since the USDA zone info for Eugene may not be accurate from year to year the actual date of last frost is different every year. Since half of the time in Eugene it frosts late in the year after March 15 be ready to cover your bidens if you have a surprise late frost.

USDA Zone Info for Eugene

Here is the info for USDA Zone 8b.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	15°F
Highest Expected Low	20°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 20°F.

Plants to Grow in Eugene

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