2. Spring and Fall Planting
If you are planning to plant your broccoli during the spring months you are going to want to sow your seeds or set up your transplants in your garden about two or three weeks before the last frost date of the spring. If you are transplanting you should assume ten less days for the growth or what is noted as the days to maturity as provided on the seed packet.
In order to protect the young plants from frost, you may want to use a cold frame to protect them. If you are planting broccoli during the fall months you will want to plan to plant the seeds about 85 to 100 days before the average first frost of the fall.
If you live in a warmer climate, planting in the fall is the best. The reason for this is because broccoli thrives in cooler weather. In most places, planting of broccoli should be done in the middle to late summer.