One of the best tools that you have as gardeners to help us figure out your gardening schedule is the 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.

In Mchenry you can determine when to plant salpiglossis by referring to the USDA zone info.

Planting Calendar for Salpiglossis

Frost tolerance for salpiglossis:	Not tolerant of frost.
When to plant:	After the last frost.

Salpiglossis require warm weather which means that you must wait until it warms up after all chance of frost has passed before you can plant them.

The earliest that you can plant salpiglossis in Mchenry 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 salpiglossis and expect a good harvest is probably August. You probably don't want to wait any later than that or else your salpiglossis may not have a chance to fully mature. You can get started a little bit earlier by starting your salpiglossis indoors.

Last Frost Date

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

Always keep in mind that USDA zone info for Mchenry may not be accurate from year to year and the actual date of last frost will vary from year to year. Half of the time in Mchenry you get surprised by a frost after April 15 so always be ready to cover your salpiglossis if you have a late frost.

USDA Zone Info for Mchenry

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 Mchenry

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