What to Plant in August: 15 Crops That Still Have Time to Grow
TL;DR: In August, plant fast crops such as radishes, arugula, spinach, lettuce, turnips, kale, and quick carrots, then match each choice to the number of days before your first frost. If time is short, focus on baby greens and quick roots, sow in small batches, and use row covers to squeeze a little more life out of the season.
If you are a home gardener looking to extend your harvest into autumn, late summer gives you a surprisingly useful second planting window. Knowing what to plant in August comes down to matching quick-maturing varieties with the warm growing days you still have left.
| Your Growing Zone | Good August Choices |
|---|---|
| Zones 3 to 5: Early Frost | Radishes, turnips, baby-leaf spinach, fast lettuces, arugula, kale transplants, and quick carrots |
| Zones 6 to 7: Middle Zones | All of the above, plus fast beets, more carrot varieties, and steady successions of salad greens |
| Zones 8 to 10: Warmer / Late Frost | All of the above, plus fast bush beans and longer successions of greens |
Quick Take: Your hardiness zone is useful, but your first fall frost date is the real planting clock. The more frost-free days you have left, the more choices you have.
This guide will help you build a productive late-season garden before winter arrives. We will count backward from your frost date, using the same basic method from our What to Plant in July guide, then match crops to the growing days you actually have left.
And if August already feels late, don’t write the garden off. There is often more time left than it seems.
Check our First Frost Date Explainer if you need help finding your local date.
The Count-Back Method: How to Know If It Is Too Late
Here is the question I ask before putting any seed in the ground this late in summer:
Will this crop actually have time to give me something worth harvesting?
You do not need a complicated planting calendar to answer it. A little counting gets you surprisingly close.
Start With Your Frost Date
Your average first frost date is the historical date when your area typically gets its first freezing temperature around 32°F. Weather will never follow that date perfectly, but it gives you a sensible finish line.
Then look at the Days to Maturity (DTM) on the seed packet.
That number matters, but I never take it completely at face value for fall planting. A crop growing through September does not usually move at the same pace as one growing through May or June. Days are getting shorter and nights are cooling.
The August Planting Formula
To estimate your planting deadline, use this count-back formula:
Last Safe Sow Date = First Frost Date − (DTM + Fall Factor + Harvest Window)
A useful starting point is:
- Fall Factor: 14 days. This gives you a cushion for shorter days and slower cool-weather growth.
- Harvest Window: 7 to 14 days. This gives you time to pick more than once instead of hoping everything matures just before frost.
A Quick Count-Back Example
Example: Bush Beans
First frost: October 15
Days to maturity: 50 days
Fall factor: 14 days
Harvest window: 7 days
50 + 14 + 7 = 71 days needed
Count backward 71 days from October 15 and your last reasonably safe sowing date lands around August 5.
This little calculation has saved me from plenty of optimistic seed-packet decisions. August has a way of making 50 days look generous on paper. Then September arrives, the light changes, and suddenly those plants are not in nearly as much of a hurry as you are.
Seeds or Transplants?
If your calendar is getting tight, established transplants can sometimes buy back roughly 10 to 14 days compared with starting the same crop from seed.
That is one reason I am happy to buy a healthy kale transplant in August even though I would normally grow it from seed.
Note: Transplants help, but they do not perform miracles. You still need enough cool-season growing time for the plant to mature.
If you do not know your frost date yet, use our frost-date explainer with its zip-code lookup and microclimate tips to find your starting number.
Your August Planting Roadmap: Match Your Remaining Days to the Right Crops
Late-summer planting gets easier once you stop asking, “What grows in my zone?” and start asking:
“How many decent growing days do I actually have left?”
USDA hardiness zones tell you about typical winter minimum temperatures. They do not tell you exactly how many productive growing days remain before cold weather slows or stops your crops.
Your 3-Step August Planting Checklist
Before opening another seed packet:
- Find your average first fall frost date.
- Count how many days you have left.
- Match that number to the planting window below.
August Frost-Window Planting Guide
| Days Until Frost | Crop Strategy | Priority Vegetables | Trade-Off to Consider |
|---|---|---|---|
| 70+ Days | Warm-season finales and longer-standing cool crops | Bush beans in warm regions, kale, carrots | Bush beans produce quickly but are frost sensitive. Kale and carrots take longer, but cool weather can improve their flavor. |
| 40 to 69 Days | Fast root crops and hardy cooking greens | Turnips, spinach, lettuce | Good late-season potential, but lingering heat can slow germination or trigger bolting in greens. |
| 20 to 39 Days | Ultra-fast crops and baby salad greens | Radishes, baby arugula, baby spinach | Harvests can come quickly, but yields are smaller and protection becomes more important as frost approaches. |
August Planting at a Glance
70+ days left
Carrots + kale + turnips + greens + possible bush beans
↓
40 to 69 days left
Radishes + spinach + lettuce + turnips + arugula
↓
20 to 39 days left
Radishes + baby greens + turnip greens
↓
Frost closing in
Harvest young + protect hardy crops + stop gambling on slow crops
That is the basic rhythm of late-season sowing. As the season gets shorter, I stop chasing full-sized crops and start thinking more about young roots, baby leaves, and things I can actually get onto a plate.
The “On the Edge” Rule
If your day count lands right between two planting windows, resist the temptation to squeeze in the slowest crop you can find.
I usually go the other way and choose something a little faster.
Choose Short-Season Cultivars
Look for varieties with the shortest published Days to Maturity. You might give up a little final size, but that is usually a fair trade when frost is creeping closer.
Keep Row Covers Ready
A lightweight floating row cover can help protect beds from light frosts and hold a little extra warmth around young plants.
It is useful insurance. Just don’t treat it like a magic shield. Autumn wind, cold soil, and a hard freeze eventually catch up with the garden.
If you missed an earlier sowing from our What to Plant in July guide, August can still give you another shot with quick, cool-season crops matched to your actual timeline.
Phase 1: 70+ Days Out (Early August Foundation)
Goal: Use the remaining summer warmth to establish crops that can keep growing as temperatures ease into fall.
With 70 days or more in hand, you still have room to be a little ambitious. I would not limit myself to quick salad greens yet.
What to Plant
| Crop | Days to Maturity | Why It Works in August |
|---|---|---|
| Carrots | 60 to 75 days | Cool fall weather can improve sweetness. Choose faster varieties if your frost date is on the early side. |
| Kale | 50 to 60 days | One of the most dependable fall crops. Mature leaves often taste sweeter after cool nights and light frost. |
| Turnips | 40 to 55 days | A forgiving two-for-one crop that gives you edible greens first and roots later. |
| Fast Salad Greens | 30 to 45 days | Leaf lettuces and arugula establish quickly and can be harvested young. |
| Bush Beans | 50 to 55 days | Fast and productive in warm regions, but highly frost sensitive. |
If I had space for only two, I would probably give it to kale and carrots. Kale keeps producing, while carrots are one of those crops that make waiting for cooler weather worthwhile.
Bush beans are harder to resist, especially when the soil is still warm. I just would not plant them unless the frost math gives them a proper chance.
How to Plant in August Heat
Prepare the Seedbed First
Water the bed deeply before sowing so the soil below the surface starts out evenly moist.
During very hot weather, a little temporary afternoon shade can make germination much easier. It does not have to be fancy. Even a bit of shade during the hottest part of the day can help.
Sow in Small Successions
Plant small batches of greens every 7 to 14 days rather than sowing everything at once.
I prefer this anyway. One enormous sowing sounds efficient until everything becomes ready in the same week.
What to Watch For
Keep an eye on the soil surface.
August sun can dry that top inch surprisingly fast. Once it crusts over, tiny seedlings have a much harder time pushing through.
Newly sown rows deserve a quick check until they are established.
“Worth It” Trade-Offs
| Crop Choice | What You Gain | What You Risk |
|---|---|---|
| Bush beans | Fast, satisfying harvests | A frost can end the crop overnight |
| Carrots | Sweet fall roots | Slower payoff |
| Kale | Long harvest window and cold tolerance | Takes up bed space longer |
There is no perfect choice here. If you enjoy quick wins, beans are tempting. If you would rather have something dependable hanging around into fall, kale wins for me.
Phase 2: 40 to 69 Days Out (The August Sweet Spot)
This is probably my favorite late-summer planting window.
There is still enough time to get a real harvest, but the decisions become easier. Fast roots and leafy greens start making much more sense than anything ambitious.
What to Plant
Radishes
Radishes are hard to beat here. They germinate quickly, many varieties mature in about a month, and they do not ask for much garden space.
Spinach
Spinach is excellent for baby-leaf harvesting, although hot soil can make germination a little maddening.
Lettuce
Loose-leaf lettuce and salad mixes make more sense to me this late in summer than waiting around for perfect full heads.
Turnips
Turnips earn their place because you can eat the tops even if the roots never quite become as large as you hoped.
Arugula and Mustards
Both are useful when you want something quick that you can keep cutting rather than waiting on one big harvest.
If I wanted the safest quick win from this group, I would start with radishes.
Getting Seeds Through August Heat
The trick is not keeping the whole garden soaking wet. It is keeping that shallow seed zone from drying out while the seeds germinate.
I have had beds look completely lifeless for several days and then suddenly show neat little green rows the next morning. That is why I try not to scratch around looking for seeds too soon. Usually they are better left alone.
Give Tiny Seeds a Good Bed
Rake the top layer until it is loose and crumbly.
Lettuce, spinach, and carrot seeds do not appreciate fighting through chunky mulch or hard lumps of soil.
Stagger the Sowing
Short rows every 7 to 10 days work better than one huge planting if you want a steady harvest.
Example: Instead of emptying a whole packet of radishes into the garden on August 10, sow a short row, then another about a week later. If your frost window still looks good, do it once more.
It is a small habit, but it makes the harvest much easier to use.
When August Heat Fights Back
Heat matters just as much as the calendar.
If lettuce begins bolting or the seedbed is drying too quickly, give it some afternoon shade and keep watering more consistent.
I have learned not to argue with a brutally hot afternoon. A little shade is often less work than repeatedly trying to cool baked soil with the hose.
Baby Greens or Full Heads?
This is one place where I lower my expectations on purpose.
If the weather stays hot, I start cutting lettuce and spinach young instead of holding out for perfect mature plants. You get food sooner, and you are less likely to lose the whole crop to bolting.
The same thinking applies to roots. If your frost window is getting uncomfortable, fast radishes and turnips make more sense than a slower crop that needs everything to go right.