The USDA Zone info is a great tool for gardeners to help us determine your gardening schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In Oskaloosa you can estimate when it's the best time to plant lysimachia by checking out the USDA zone info.

Planting Calendar for Lysimachia

Frost tolerance for lysimachia:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

Since lysimachia are moderately cold tolerant you can plant them a little earlier in the year than other frost tender plants.

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

The last month that you can plant lysimachia and expect a good harvest is probably September. Any later than that and your lysimachia may not have a chance to really do well. You can get started a couple of weeks earlier by starting your lysimachia indoors.

Last Frost Date

On average the last frost has passed is on April 15 in Oskaloosa. In the coldest months of winter you can expect an average low temperature of -15°F.

Since the USDA zone info for Oskaloosa is an average the actual date of last frost can change quite a bit from year to year. Since half of the time in Oskaloosa you get surprised by a frost after April 15 be ready to protect your lysimachia if you have one of those late frosts.

USDA Zone Info for Oskaloosa

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 Oskaloosa

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