One of the first steps you take when you are determining your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The USDA zone info for Helena can be used to figure out when it's the best time to plant dichondra.

Planting Calendar for Dichondra

Frost tolerance for dichondra:	Tolerant of a very small amount of frost.
When to plant:	Up to 3 weeks before last frost.

You can plant dichondra just a tiny bit earlier in the year because they are one of those plants that can tolerate a tiny bit of cold weather.

The earliest that you can plant dichondra in Helena 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 dichondra and expect a good harvest is probably August. You probably don't want to wait any later than that or else your dichondra may not have a chance to grow to maturity. If you are starting your dichondra indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

In Helena the average date of last frost happens on May 15. In the coldest months of winter you can expect an average low temperature of -25°F.

Since the USDA zone info for Helena is just an average the actual date of last frost will vary from year to year. Since half of the time in Helena last frost occurs after May 15 be ready to cover your dichondra in the event of one of those late frosts.

USDA Zone Info for Helena

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 Helena

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