Before planting it is a good idea to find your USDA Zone info to estimate your garden schedule. The most important data that the zone info tells us is average last frost and the lowest expected temperature for your area.

In La Grande you can determine when it's the best time to plant missouri primrose by using the USDA zone info.

Planting Calendar for Missouri Primrose

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

You can plant missouri primrose just a bit earlier in the year because they are moderately cold tolerant.

The earliest that you can plant missouri primrose in La Grande 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 missouri primrose and expect a good harvest is probably September. If you wait any later than that and your missouri primrose may not have a chance to fully mature. You can get started a few weeks earlier by starting your missouri primrose indoors.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in La Grande. In the coldest months of winter you should expect an average low temperature of -5°F.

Keep in mind that USDA zone info for La Grande may not be accurate from year to year and the actual date of last frost is different every year. Since half of the time in La Grande there is a last frost after April 15 be ready to cover your missouri primrose if you have one of those late frosts.

USDA Zone Info for La Grande

Here is the info for USDA Zone 6b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-5°F
Highest Expected Low	0°F

This means that on a really cold year, the coldest it will get is -5°F. On most years you should be prepared to experience lows near 0°F.

Plants to Grow in La Grande

You may be interested in your other planting guides for La Grande.