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.

The USDA zone info for Havre can be reviewed to figure out when to plant oriental poppies.

Planting Calendar for Oriental poppies

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

Oriental poppies are moderately cold tolerant which means that you can get them planted earlier than more sensitive plants.

The earliest that you can plant oriental poppies in Havre 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 oriental poppies and expect a good harvest is probably August. Any later than that and your oriental poppies may not have a chance to fully mature. Starting your oriental poppies indoors is a great way to get them started a little bit earlier.

Last Frost Date

On average all chance of frost has passed is on May 15 in Havre. It might get as low as -30°F during the coldest months of winter.

It's important to remember that USDA zone info for Havre is not always accurate and the actual date of last frost is different every year. Since half of the time in Havre last frost occurs after May 15 be ready to protect your oriental poppies if you have a surprise late frost.

USDA Zone Info for Havre

Here is the info for USDA Zone 4a.

Average Date of Last Frost (spring)	May 15
Average Date of First Frost (fall)	September 15
Lowest Expected Low	-30°F
Highest Expected Low	-25°F

This means that on a really cold year, the coldest it will get is -30°F. On most years you should be prepared to experience lows near -25°F.

Plants to Grow in Havre

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