The USDA Zone info is a great tool for gardeners to help us estimate 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.

A common way of estimating when it's possible to plant creeping phlox is to use the USDA zone info for Onalaska.

Planting Calendar for Creeping Phlox

Frost tolerance for creeping phlox:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Creeping Phlox can survive in quite a bit of cold which means that you can plant them quite a bit earlier in the year than more sensitive plants.

The earliest that you can plant creeping phlox in Onalaska is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant creeping phlox and expect a good harvest is probably August. You probably don't want to wait any later than that or else your creeping phlox may not have a chance to fully mature. You can get started a few weeks earlier by starting your creeping phlox indoors.

Last Frost Date

In Onalaska the average date of last frost happens on May 15. It might get as low as -25°F during the coldest months of winter.

Since the USDA zone info for Onalaska may not be accurate from year to year the actual date of last frost is different every year. Half of the time in Onalaska you get surprised by a frost after May 15 so make sure that you are ready to cover your creeping phlox if you have a late frost.

USDA Zone Info for Onalaska

Here is the info for USDA Zone 4b.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-25°F
Highest Expected Low	-20°F

This means that on a really cold year, the coldest it will get is -25°F. On most years you should be prepared to experience lows near -20°F.

Plants to Grow in Onalaska

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