The USDA Zone info is a great tool for gardeners to help us figure out your gardening schedule. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

The earliest that you can plant parsley in Helena should be figured out by checking out the USDA zone info.

Planting Calendar for Parsley

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

Parsley do well in some cold which tells us that you can plant them a little earlier in the year than plants that are more sensitive to the cold.

The earliest that you can plant parsley in Helena is March. However, you really should wait until April if you don't want to take any chances.

The last month that you can plant parsley and expect a good harvest is probably August. You probably don't want to wait any later than that or else your parsley may not have a chance to really do well. If you are starting your parsley indoors then you might be able to get away with starting them a couple of weeks earlier.

Last Frost Date

The average date of last frost is May 15 in Helena. You can expect an average low temperature of -25°F in 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. Half of the time in Helena you get surprised by a frost after May 15 so always be ready to protect your parsley 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.