One of the best tools that you have as gardeners to help us determine 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.

You will be able to estimate when you can plant forget-me-not by using the USDA zone info for Grinnell.

Planting Calendar for Forget-Me-Not

Frost tolerance for forget-me-not:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

You can plant forget-me-not a bit earlier in the year because they are one of those plants that can tolerate a little bit of cold weather.

The earliest that you can plant forget-me-not in Grinnell 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 forget-me-not and expect a good harvest is probably September. You probably don't want to wait any later than that or else your forget-me-not may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your forget-me-not indoors.

Last Frost Date

On average the last frost is on April 15 in Grinnell. In the coldest months of winter you can expect an average low temperature of -20°F.

Always keep in mind that the actual date of last frost is not always accurate because it is based on the USDA zone info for Grinnell and it changes from year to year. Since half of the time in Grinnell it frosts late in the year after April 15 be ready to protect your forget-me-not in the event of a surprise late frost.

USDA Zone Info for Grinnell

Here is the info for USDA Zone 5a.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-20°F
Highest Expected Low	-15°F

This means that on a really cold year, the coldest it will get is -20°F. On most years you should be prepared to experience lows near -15°F.

Plants to Grow in Grinnell

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