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.

By checking out the USDA zone info for Winthrop Harbor it's a good idea to figure out when you can plant nasturtium.

Planting Calendar for Nasturtium

Frost tolerance for nasturtium:	Not tolerant of frost.
When to plant:	After the last frost when the weather gets warmer.

Nasturtium require warm weather which means that it's necessary to wait until it warms up after the last frost has passed before you can plant them.

The earliest that you can plant nasturtium in Winthrop Harbor 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 nasturtium and expect a good harvest is probably August. Any later than that and your nasturtium may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your nasturtium indoors.

Last Frost Date

On average the last frost is on April 15 in Winthrop Harbor. You should expect an average low temperature of -15°F in the coldest months of winter.

Since the USDA zone info for Winthrop Harbor may not be accurate from year to year the actual date of last frost will vary from year to year. Since half of the time in Winthrop Harbor you get surprised by a frost after April 15 be ready to cover your nasturtium if you have a surprise late frost.

USDA Zone Info for Winthrop Harbor

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 Winthrop Harbor

You may be interested in your other planting guides for Winthrop Harbor.