Deer food plots benefit from brassicas planted in late summer, around sixty days before the first frost. Knowing exactly When To Plant Brassicas For Deer can mean the difference between a lush, protein-rich plot and a disappointing failure. This timing ensures your plants mature just as deer need them most—during the hunting season and into winter.
Brassicas like turnips, radishes, kale, and rape are cold-hardy powerhouses. They thrive in cool weather and actually get sweeter after a frost. But if you plant them too early, they bolt or get eaten by insects. Too late, and they won’t establish before the freeze. Let’s break down the exact timing for your region.
Understanding Brassica Growth Cycles
Brassicas are cool-season annuals. They germinate fast in warm soil but grow best when temperatures drop below 70°F. Their root systems develop quickly, and the leafy tops provide forage from early fall through late winter.
Most varieties need about 60 to 90 days from seeding to reach full maturity. This is why the 60-day window before your average first frost date is the golden rule. You want the plants to be well-established but still tender when deer start hitting them hard.
Key Growth Stages To Watch
Understanding these stages helps you time your planting perfectly:
- Germination: 5–10 days after planting, depending on soil moisture and temperature.
- Vegetative growth: Leaves expand rapidly for 4–6 weeks. This is when deer first start browsing.
- Root bulb development: For turnips and radishes, bulbs swell after 45–60 days. Deer dig these up later.
- Frost sweetening: After a hard frost, starches convert to sugars. This is peak attraction.
If you plant too early, the plants may flower and go to seed before deer really need them. That’s wasted effort. Stick to the late summer window.
When To Plant Brassicas For Deer
Now let’s get specific. The exact date depends on your hardiness zone and local frost patterns. But the formula is simple: count backward from your average first frost date by 60 to 90 days.
For most of the Midwest and Northeast, that means planting between mid-July and mid-August. In the South, you might push into early September. In northern zones, you may need to plant as early as late June.
Regional Planting Windows
Here’s a rough guide by region:
- Northern states (Zones 3-4): Plant from late June to mid-July. First frost often hits in early September.
- Midwest and Mid-Atlantic (Zones 5-6): Plant from mid-July to early August. First frost around mid-October.
- Southeast and Deep South (Zones 7-8): Plant from late August to mid-September. First frost can be November or later.
- Pacific Northwest (Zones 7-8): Plant in late August. Milder winters allow later planting.
Check your local extension office for exact frost dates. A simple online search for “first frost date [your county]” gives you a reliable number.
Soil Temperature Matters Too
Brassica seeds germinate best when soil temps are between 50°F and 85°F. If the soil is over 90°F, germination drops sharply. In hot southern summers, wait until late August when soil cools a bit.
Use a soil thermometer. Stick it 2 inches deep in the morning. If it’s above 85°F, hold off a week or two. If it’s below 50°F, you’ve waited too long.
Preparing Your Food Plot For Brassicas
Good timing means nothing without proper soil prep. Brassicas are heavy feeders. They need fertile, well-drained soil with a pH between 6.0 and 7.0.
Soil Testing Is Non-Negotiable
Get a soil test at least 60 days before planting. This gives you time to add lime if needed. Brassicas prefer a pH of 6.5. If your soil is acidic, lime takes months to fully react, so plan ahead.
You can buy a DIY test kit or send samples to your state lab. The cost is small compared to the value of a successful plot.
Fertilizer And Nutrient Needs
Brassicas need nitrogen for leafy growth, phosphorus for root development, and potassium for overall health. A balanced fertilizer like 10-10-10 works well. Apply at a rate of 300–400 pounds per acre.
If you’re planting into a existing clover or alfalfa field, reduce nitrogen. Too much nitrogen makes brassicas leafy but less attractive to deer.
Tilling And Seedbed Preparation
Brassica seeds are small. They need a firm, fine seedbed for good soil contact. Till or disk the soil to a depth of 4–6 inches, then smooth it out with a drag or cultipacker.
If you’re no-till drilling, make sure the previous crop residue is minimal. Brassicas struggle to push through thick thatch.
Planting Methods And Seeding Rates
You have several options for planting brassicas. Each method affects timing slightly.
Broadcasting
Broadcasting is the simplest method. Spread seed by hand or with a spreader, then lightly rake or cultipack to cover seeds ¼ to ½ inch deep. Seeding rate is 8–12 pounds per acre for pure brassica stands.
Broadcasting works best if rain is in the forecast within a few days. Otherwise, seeds may dry out. Plant just before a predicted rain shower.
Drilling
Drilling gives better seed-to-soil contact and more uniform emergence. Set your drill to plant seeds ¼ to ½ inch deep. Seeding rate is lower, around 6–8 pounds per acre.
Drilling is more precise but requires a specialized planter. If you have access, it’s the most reliable method.
Overseeding Into Existing Plots
You can overseed brassicas into existing clover or cereal grain plots. This works well if you time it right. Mow the existing crop short, broadcast brassica seed, and let rain work it in.
This method extends your plot’s productivity without full replanting. Just be aware that competition from existing plants can reduce brassica establishment.
Common Mistakes In Timing Brassica Plots
Even experienced food plotters make timing errors. Here are the most common ones and how to avoid them.
Planting Too Early
Planting in early summer when soil is hot and dry leads to poor germination. Seeds may rot or get eaten by birds. Plants that do emerge may bolt to seed quickly, becoming woody and unpalatable.
If you plant in June in the South, your brassicas will be mature by August—long before deer need them. They’ll be tough and less attractive.
Planting Too Late
Planting less than 45 days before first frost is risky. Young brassicas are vulnerable to hard freezes. They may not develop enough root mass to survive winter.
In northern zones, planting in September is usually too late. The plants won’t have time to establish before the ground freezes.
Ignoring Local Microclimates
Your property may have different frost patterns than the nearest weather station. Low-lying areas frost earlier. South-facing slopes stay warmer longer. Adjust your planting date by a week or two based on your specific site.
Observe your land. Note when frost first appears in your food plot area. Use that as your reference, not a generic county date.
Maximizing Deer Attraction With Brassicas
Timing is just one piece. How you manage your brassica plot after planting also affects deer use.
Weed Control
Weeds compete with brassicas for nutrients and water. If weeds get ahead, your brassicas will be stunted. Use a pre-emergent herbicide like clethodim or sethoxydim if needed.
Mowing or hand-pulling large weeds also works. Just don’t let them go to seed and create problems next year.
Insect Pressure
Flea beetles and aphids love brassicas. In hot, dry weather, they can decimate young plants. If you see small holes in leaves, treat with an insecticide like Sevin or use row covers for small plots.
Healthy, fast-growing plants tolerate insects better. Good timing and soil fertility reduce pest damage.
Deer Browsing Pressure
Deer may start hitting brassicas as soon as they emerge. In high-density areas, they can wipe out a plot before it establishes. Use a temporary fence or repellent for the first 4–6 weeks.
Once plants are 8–10 inches tall, they can handle moderate browsing. The goal is to let them establish a strong root system before heavy grazing.
Variety Selection Based On Timing
Different brassica varieties have different maturity dates. Choose based on your planting window.
Fast-Maturing Varieties
If you’re planting late, choose varieties that mature in 45–60 days. Examples include:
- Purple Top Turnip: 55–60 days
- Daikon Radish: 50–60 days
- Rape (Dwarf Essex): 50–60 days
These are ideal for southern zones or late planting windows.
Slow-Maturing Varieties
If you have a long growing season, use varieties that take 70–90 days. Examples include:
- Kale (Siberian or Rape): 70–80 days
- Canola: 80–90 days
- Swede (Rutabaga): 80–90 days
These produce more biomass and provide forage into late winter.
Blends And Mixes
Most commercial deer plot blends combine fast and slow varieties. This spreads out the availability. A typical blend might include turnips, radishes, kale, and rape.
If you’re mixing, plant based on the slowest variety’s maturity. That way, everything has time to develop.
Frost And Its Effect On Brassicas
Frost is your friend with brassicas. It triggers the conversion of starches to sugars, making the plants sweeter and more attractive to deer.
After a hard frost (below 28°F), brassicas become highly palatable. Deer will dig through snow to get at the bulbs. This is why timing is critical—you want the plants to be mature enough to survive frost but still tender.
If you plant too early, the plants may be too woody to sweeten properly. If too late, they may not have enough root mass to survive the frost.
Frequently Asked Questions
What Is The Best Month To Plant Brassicas For Deer?
The best month varies by region. For most of the US, August is ideal. Northern zones may plant in July, while southern zones can plant into September. Always count back 60 days from your first frost date.
Can I Plant Brassicas In The Spring For Deer?
Spring planting is possible but less effective. Brassicas planted in spring will mature in summer when deer have plenty of other food. They may bolt and become unpalatable. Fall-planted brassicas are much more attractive to deer.
How Late Can You Plant Brassicas For Deer?
You can plant as late as 45 days before your first frost, but success drops. Late-planted brassicas may not establish fully. For best results, stick to the 60–90 day window before frost.
Do Brassicas Need Fertilizer When Planting?
Yes. Brassicas are heavy feeders. Apply a balanced fertilizer like 10-10-10 at planting time. A soil test will tell you exactly what your plot needs. Lime is also important if your pH is low.
Will Deer Eat Brassicas Before Frost?
Deer will eat brassicas at any stage, but they prefer them after frost. Young, tender leaves are browsed early. After frost, the sweetness increases, and deer will target bulbs and roots heavily.
Final Thoughts On Timing Your Brassica Plot
Getting the timing right for brassicas is simpler than it sounds. Mark your calendar for 60 days before your average first frost. Prepare your soil, choose the right varieties, and plant with confidence.
Deer will reward you with consistent visits throughout the hunting season and into winter. A well-timed brassica plot is one of the best investments you can make for your property.
Remember to monitor your plot after planting. Check for weeds, insects, and deer pressure. Adjust your management as needed. With the right timing and care, your brassica plot will be a magnet for deer when they need it most.
Now go check your frost dates and get those seeds in the ground. Your deer herd will thank you.