by 
The Curious Bag
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<h4 class="dechead">On One Hand: On One Hand: In the Spring
Planting peppers in the spring will give you an earlier harvest. Young pepper plants can be planted outdoors after night time temperatures have risen above between 50 and 55 degrees Fahrenheit. Cooler temperatures can affect flower setting and cause the leaves to turn yellow.
On the Other: On the Other: Before the First Frost
For fall peppers, you can plant young pepper plants 12 to 16 weeks before the first expected frost. Pepper plants are very sensitive to cold and frost, but can produce well until night time temperatures drop below 50 or 55 degrees Fahrenheit.
Bottom Line
The exact best time for pepper planting will depend on the climate where you are planting. By planting several plants in the spring and several three to four months before the first expected frost, a garden can produce peppers beginning in early summer and extending throughout the fall.
Source:
University of Illinois Extension: Peppers
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