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

It's possible to figure out when it's the best time to plant rosemary by reviewing the USDA zone info for West Salem.

Planting Calendar for Rosemary

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

Rosemary are very cold tolerant which tells us that you can start planting them much earlier than more sensitive plants.

The earliest that you can plant rosemary in West Salem 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 rosemary and expect a good harvest is probably August. If you wait any later than that and your rosemary may not have a chance to grow to maturity. You can get started a few weeks earlier by starting your rosemary indoors.

Last Frost Date

On average all chance of frost has passed is on May 15 in West Salem. It might get as low as -25°F during the coldest months of winter.

Since the USDA zone info for West Salem is just an average the actual date of last frost will vary from year to year. Half of the time in West Salem it frosts late in the year after May 15 so just be sure to be ready to protect your rosemary if you have one of those late frosts.

USDA Zone Info for West Salem

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 West Salem

You may be interested in your other planting guides for West Salem.