One of the best tools that you have as gardeners to help us figure out 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.

It's a good idea to estimate when you can plant monkey flower by checking out the USDA zone info for Billings.

Planting Calendar for Monkey Flower

Frost tolerance for monkey flower:	Not tolerant of frost.
When to plant:	After the last frost has passed.

Since monkey flower do not do well in cold weather you need to wait until after the last frost has passed before you can plant them.

The earliest that you can plant monkey flower in Billings is May. However, you really should wait until June if you don't want to take any chances.

The last month that you can plant monkey flower and expect a good harvest is probably August. If you wait any later than that and your monkey flower may not have a chance to grow to maturity. You can get started a couple of weeks earlier by starting your monkey flower indoors.

Last Frost Date

On average all chance of frost has passed is on May 15 in Billings. In the coldest months of winter you can expect an average low temperature of -25°F.

Always keep in mind that USDA zone info for Billings is just an average and the actual date of last frost can change quite a bit from year to year. Half of the time in Billings you get surprised by a frost after May 15 so always be ready to cover your monkey flower if you have a surprise late frost.

USDA Zone Info for Billings

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 Billings

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