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.

One way of determining when it's possible to plant savoy cabbage is to use the USDA zone info for Helena.

Planting Calendar for Savoy cabbage

Frost tolerance for savoy cabbage:	Very tolerant of frost.
When to plant:	Up to 7 weeks before last frost.

Since savoy cabbage are one of those plants that can tolerate quite a bit of cold weather you can plant them much earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant savoy cabbage in Helena 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 savoy cabbage and expect a good harvest is probably September. You probably don't want to wait any later than that or else your savoy cabbage may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your savoy cabbage indoors.

Last Frost Date

On average the last frost is on March 15 in Helena. It might get as low as 10°F during the coldest months of winter.

Always keep in mind that USDA zone info for Helena is just an average and the actual date of last frost is different every year. Since half of the time in Helena you get a frost after March 15 be ready to cover your savoy cabbage if you have a surprise late frost.

USDA Zone Info for Helena

Here is the info for USDA Zone 8a.

Average Date of Last Frost (spring)	March 15
Average Date of First Frost (fall)	November 15
Lowest Expected Low	10°F
Highest Expected Low	15°F

This means that on a really cold year, the coldest it will get is 10°F. On most years you should be prepared to experience lows near 15°F.

Plants to Grow in Helena

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