One of the first steps you take when you are getting a good idea your gardening schedule is find your USDA Zone info. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

A common way of figuring out when it's the best time to plant lysimachia is to refer to the USDA zone info for Hyrum.

Planting Calendar for Lysimachia

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

Lysimachia do ok in moderate cold which means that you can plant them a little earlier in the year than other frost tender plants.

The earliest that you can plant lysimachia in Hyrum 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 fully mature. You can get started a little bit earlier by starting your lysimachia indoors.

Last Frost Date

The average date of last frost is April 15 in Hyrum. It might get as low as -15°F during the coldest months of winter.

It's important to remember that USDA zone info for Hyrum is just an average and the actual date of last frost will vary from year to year. Half of the time in Hyrum it frosts late in the year after April 15 so be sure to be ready to cover your lysimachia if you have one of those late frosts.

USDA Zone Info for Hyrum

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 Hyrum

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