Before planting it is a good idea to find your USDA Zone info to determine your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In Northbrook you can figure out when it's possible to plant nasturtium by checking out the USDA zone info.

Planting Calendar for Nasturtium

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

It's probably a bad idea to plant nasturtium until after all chance of frost has passed because they are not cold tolerant.

The earliest that you can plant nasturtium in Northbrook 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. You probably don't want to wait any later than that or else your nasturtium may not have a chance to really do well. You can get started a couple of weeks earlier by starting your nasturtium indoors.

Last Frost Date

On average all chance of frost has passed is on April 15 in Northbrook. It might get as low as -15°F during the coldest months of winter.

Keep in mind that USDA zone info for Northbrook is not always accurate and the actual date of last frost can change quite a bit from year to year. Half of the time in Northbrook you get surprised by a frost after April 15 so always be ready to cover your nasturtium in the event of one of those late frosts.

USDA Zone Info for Northbrook

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 Northbrook

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