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Vegetable Crop Calendars (A–C)Cauliflower Planting Calendar: Timing Is Everything
Of the cabbage family, cauliflower is the least forgiving about timing, because a stress early in life can leave you with a tiny head on a big plant.
Key points
- Prevent early stress, because buttoning is hard to reverse.
- Use compact, non-root-bound transplants.
- Count back from first fall frost and add a margin.
- Blanch white varieties by covering the head with leaves.
- Keep moisture and fertility steady.
Why is cauliflower fussier than broccoli?
Cauliflower needs steady, uninterrupted growth from transplant to head. A cold snap, a dry spell, a root-bound seedling or a nutrient shortage can trigger a premature small head, which growers call buttoning. Once a plant buttons, it rarely recovers, so the goal of the calendar is to prevent stress at the start.
Broccoli forgives more, and it often keeps producing side shoots. Cauliflower gives you one head per plant, so the stakes of each planting are higher.
Extension publications from several states describe this behavior and list the conditions that most often cause it. A worked example shows the stakes. Suppose a transplant sits in a small cell for two extra weeks because rain delays planting. Its roots circle, the plant gets stressed when it finally goes out, and it throws a tiny head. Giving seedlings a bigger pot while you wait is cheap insurance.
When do you set out spring transplants?
Spring cauliflower goes out as transplants a few weeks before the last frost in many areas, but the margin is narrow. Plants set out too early can be chilled for long stretches, and plants set out too late will meet summer heat while forming the head. Look at your state guide for the recommended window and compare it with your own frost records.
Young transplants should be compact and not root-bound. Plants that sit too long in small cells are more likely to button. Move them up to larger containers if the weather delays planting out.
Harden seedlings off gradually, and keep row cover on hand. Scout the bed on a regular schedule after planting. Plants that stall, turn purple at the leaf edges or stay small after a cold week deserve a look at both soil temperature and moisture.
- Start seed indoors on your guide's schedule.
- Avoid letting seedlings become root-bound.
- Harden off before planting out.
- Cover plants when a hard freeze is forecast.
How do you time the fall crop?
Fall is often easier than spring in places where summers are hot, because heads form as the weather cools. Count back from your first fall frost using days to maturity, then add a margin for the slower growth of shortening days. The sum tells you when plants must go into the ground.
For example, if your first frost arrives in late October, you would count backward by the days your variety needs plus a cushion. This is an example of the method, so confirm your numbers locally.
Young plants set out in summer heat need shade and regular watering for the first week or two. Water the transplants in at planting and again a few days later, then keep the soil evenly moist. A long dry stretch followed by heavy rain is a common cause of lost heads.
What about blanching and head quality?
Many white varieties benefit from blanching, which means shading the head so it stays white. Gardeners tie or fold the outer leaves over the head when it is a few inches across. Colored varieties, such as purple or orange types, often do not need it, and some varieties are self-blanching. Check the notes for your variety.
Check heads often. A head that begins to loosen or look grainy is past its best, so cut it promptly. The window is short in warm weather.
Keep a notebook entry for each planting with the transplant date, the weather the first two weeks, and the date you cut heads. It becomes a local calendar over a few seasons.
What soil and feeding does it need?
Cauliflower likes fertile, well-drained soil with a near-neutral pH and a steady supply of water. Boron and other micronutrient problems are described in some state guides, and a soil test helps you see whether any adjustment is needed. Use local recommendations for lime and fertilizer, because nutrient rules vary by state.
Uneven moisture is a leading cause of poor heads. Mulch and a regular irrigation schedule help, within local water rules.
Rotate with non-brassica crops to reduce disease pressure. If you are growing cauliflower for the first time, try a small planting of two or three varieties and compare them. Extension variety trials, where available, show which ones handle your conditions.
Which pests and problems should you expect?
Cabbage worms, aphids and flea beetles visit cauliflower as they do other brassicas. Floating row cover set at planting is a common preventive step. Scouting twice a week catches small problems early.
If a pesticide is ever considered, follow the label, observe the pre-harvest interval, protect pollinators and check state rules on licensing. Ask your extension office what is currently active in your area.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.