One of the first steps you take when you are determining your gardening schedule is find your USDA Zone info. The zone info helps tell us things like average date of last frost and lowest expected temperature for your area.

In Bartlesville you can estimate when it's the best time to plant lupine by looking at the USDA zone info.

Planting Calendar for Lupine

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

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

The earliest that you can plant lupine in Bartlesville 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 lupine and expect a good harvest is probably September. Any later than that and your lupine may not have a chance to fully mature. You can get started a couple of weeks earlier by starting your lupine indoors.

Last Frost Date

In Bartlesville the average date of last frost happens on April 15. In the coldest months of winter you should expect an average low temperature of -5°F.

Remember that USDA zone info for Bartlesville is not always accurate and the actual date of last frost can change quite a bit from year to year. Half of the time in Bartlesville there is a last frost after April 15 so be sure to be ready to protect your lupine in the event of one of those late frosts.

USDA Zone Info for Bartlesville

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 Bartlesville

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