One of the best tools that you have as gardeners to help us estimate your gardening schedule is the USDA zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Helena you can figure out when to plant shasta daisys by referring to the USDA zone info.

Planting Calendar for Shasta Daisys

Frost tolerance for shasta daisys:	Tolerant of some frost.
When to plant:	Up to 5 weeks before last frost.

You can plant shasta daisys a little 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 shasta daisys 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 shasta daisys and expect a good harvest is probably September. Any later than that and your shasta daisys may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your shasta daisys indoors.

Last Frost Date

On average the last frost has passed is on March 15 in Helena. In the coldest months of winter you should expect an average low temperature of 10°F.

Keep in mind that USDA zone info for Helena is not always accurate and the actual date of last frost changes from year to year. Half of the time in Helena it frosts late in the year after March 15 so just be sure to be ready to protect your shasta daisys if you have one of those late frosts.

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.