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When to Plant Lettuce in Castle Rock, CO

One of the first steps you take when you are making a decision about 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.

The earliest that you can plant lettuce in Castle Rock can be determined by looking at the USDA zone info.

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Planting Calendar for Lettuce

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

Lettuce are one of those plants that can tolerate a little bit of cold weather which means that you can plant them a little bit earlier than other frost tender plants.

JanFebMarAprMayJunJulAugSepOctNovDec
Legend 
A good time to plant lettuce
Possibly ok, but a risky time to plant lettuce
Probably not a good time to plant lettuce

The earliest that you can plant lettuce in Castle Rock 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 lettuce and expect a good harvest is probably September. You probably don't want to wait any later than that or else your lettuce may not have a chance to really do well. If you are starting your lettuce indoors then you might be able to get away with starting them a little bit earlier.

Last Frost Date

In Castle Rock the average date of last frost happens on April 15. You can expect an average low temperature of -15°F in the coldest months of winter.

It's important to remember that the actual date of last frost is an average because it is based on the USDA zone info for Castle Rock and it changes from year to year. Since half of the time in Castle Rock it frosts late in the year after April 15 be ready to protect your lettuce in the event of a late frost.

USDA Zone Info for Castle Rock

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 Castle Rock

You may be interested in your other planting guides for Castle Rock.