Before planting it is a good idea to find your USDA Zone info to figure out 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 Pueblo you can determine when it's the best time to plant primula by looking at the USDA zone info.

Planting Calendar for Primula

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

Primula tend to make it in cold weather which tells us that you can plant them earlier in the year than more sensitive plants.

The earliest that you can plant primula in Pueblo 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 primula and expect a good harvest is probably September. If you wait any later than that and your primula may not have a chance to grow to maturity. Starting your primula indoors is a great way to get them started a few weeks earlier.

Last Frost Date

On average the last frost when the weather gets warmer is on April 15 in Pueblo. You should expect an average low temperature of -15°F in the coldest months of winter.

It's important to remember that USDA zone info for Pueblo is an average and the actual date of last frost can change quite a bit from year to year. Since half of the time in Pueblo you get surprised by a frost after April 15 be ready to protect your primula in the event of a surprise late frost.

USDA Zone Info for Pueblo

Here is the info for USDA Zone 5b.

Average Date of Last Frost (spring)	April 15
Average Date of First Frost (fall)	October 15
Lowest Expected Low	-15°F
Highest Expected Low	-10°F

This means that on a really cold year, the coldest it will get is -15°F. On most years you should be prepared to experience lows near -10°F.

Plants to Grow in Pueblo

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