The USDA Zone info is a great tool for gardeners to help us figure out 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.

In Helena you can estimate when it's the best time to plant lotus vine by referring to the USDA zone info.

Planting Calendar for Lotus Vine

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

You can plant lotus vine slightly 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 lotus vine 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 lotus vine and expect a good harvest is probably August. If you wait any later than that and your lotus vine may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your lotus vine indoors.

Last Frost Date

The average date of last frost is May 15 in Helena. You should expect an average low temperature of -25°F in the coldest months of winter.

Remember that USDA zone info for Helena is an average and the actual date of last frost changes from year to year. Half of the time in Helena you get surprised by a frost after May 15 so make sure that you are ready to cover your lotus vine in the event of a surprise late frost.

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.