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Use your first frost date, current temps, and planting method to figure out what your fall vegetable garden needs right now.
Labor Day may be the unofficial end of summer, but in the garden, September can look very different depending on where you live. Some gardeners are already experiencing cooler nights and planting fall crops, while others, especially those of us in the South, are still dealing with temps that feel very much like summer.
This is why I do not recommend planning your garden based on the calendar alone. Seeing someone online planting cabbage, carrots, lettuce, or broccoli does not automatically mean it is time for you to plant them too. Your first frost date, current temps, and the amount of growing time you have left all matter.
So use Labor Day as a checkpoint. Before you buy another transplant or start filling every empty space in the garden, here are three things I want you to check.
1. Find Your Average First Frost Date
Your average first frost date gives you an idea of when your area typically begins experiencing temps around 32°F. For fall gardening, this is important because it helps you understand how much growing time you may have left.
However, your frost date is not your transplant date.
Slower cool-season crops such as broccoli, cabbage, cauliflower, collards, and kale generally need to be growing outside several weeks before your first frost arrives. If you wait until frost is approaching to start those crops from seed, you may not have enough time for them to develop before winter.
Use this chart as a general Labor Day reference to help you figure out where you may be in the season.
Location | Average First Frost | When to Transplant Outside | What to Do on Labor Day |
|---|---|---|---|
Orlando, FL | Early Jan. | When highs are regularly 75–80°F or lower | Start fall seeds indoors. Wait for cooler outdoor temps. |
Miami, FL | Frost is infrequent | When highs are regularly 75–80°F or lower | Start indoors now. Heat, not frost, is your main concern. |
Atlanta, GA | Mid-Nov. | Mid–late Sept. | Prepare seedlings for transplanting. Starting from zero? Buy transplants. |
Huntsville, AL | Early Nov. | Early–mid Sept. | Transplant now. No seedlings started? Visit the nursery. |
Jackson, MS | Mid-Nov. | Mid–late Sept. | Prepare to transplant. Buy slower-growing crops if they are not already started. |
New Orleans, LA | Mid-Dec. | Late Oct.–early Nov. | Start fall seeds indoors now. |
Memphis, TN | Early Nov. | Early–mid Sept. | Transplant now. If you missed seed starting, buy transplants. |
Charlotte, NC | Late Oct. | Late Aug.–early Sept. | Transplant now. Starting slower crops from seed is getting late. |
Charleston, SC | Late Nov.–Dec. | Late Sept.–Oct. | Start fall seeds indoors now. |
Dallas, TX | Late Nov. | Late Sept.–early Oct. | Start or continue growing seedlings indoors. |
Houston, TX | Early Dec. | Early–mid Oct. | Start fall seeds indoors now. |
Phoenix, AZ | Early Dec. | Late Sept.–Oct. as heat eases | Start seedlings in a protected area and wait for cooler temps. |
Los Angeles, CA | Frost is infrequent | When highs are regularly 75–80°F or lower | Begin cool-season planting as temps moderate. |
Washington, DC | Mid-Nov. | Mid–late Sept. | Prepare to transplant. Buy transplants if slower crops are not started. |
New York, NY | Mid-Nov. | Mid–late Sept. | Use established seedlings. Buy transplants if needed. |
Chicago, IL | Early Nov. | Late Aug.–early Sept. | Transplant now. Use nursery transplants if you missed seed starting. |
Minneapolis, MN | Early–mid Oct. | August | Slower-crop window has mostly passed. Look for transplants and faster crops. |
Denver, CO | Early Oct. | August | Use established transplants and focus on faster crops. |
Seattle, WA | Early–mid Nov. | Early–mid Sept. | Begin transplanting established fall seedlings now. |
If your transplant window is already here or has passed and you have not started crops like broccoli, cabbage, cauliflower, collards, or kale, that does not mean you missed your entire fall garden. This may simply be the time to visit your local nursery and buy established transplants instead of waiting several more weeks for seeds to grow.
A Quick Note About These Dates
The dates above are general city references, not exact frost dates for everyone living in that area. They are based on historical frost information from The Old Farmer's Almanac Frost Dates Calculator, which uses NOAA's 1991–2020 Climate Normals and a 30% frost-probability threshold.
Your actual frost date may be earlier or later depending on your ZIP code, nearby weather station, elevation, proximity to water, and other microclimate differences. Use the chart above to gauge where you may be in the season, then look up the average first frost date for your own ZIP code before making your final planting plan.
Also remember that your first frost does not mean every fall crop has to be harvested that day. Many cool-season vegetables tolerate some frost, so you should also consider the specific crop, variety, days to maturity, frost tolerance, and your actual forecast.
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2. Check What Your Temps and Weather Are Actually Doing
Knowing your frost date is only part of the equation. September may be here, but your garden may still feel like July.
Cool-season vegetables such as broccoli, cabbage, cauliflower, collards, kale, lettuce, spinach, carrots, and peas generally perform better as temps cool. Planting too early during intense heat can lead to poor germination, stress, bolting, or plants that struggle to establish.
If it is still hot where you live, you are not necessarily behind. Your fall garden may simply need to begin indoors. Here in Central Florida, for example, frost may not arrive until around January, so my first frost date is not the best signal for deciding when fall crops should go outside. I pay much closer attention to our actual temps and begin moving more cool-season plants outside as daytime highs start spending more time around 75–80°F or lower.
What About El Niño?
There is another weather factor worth watching as we plan our fall and winter gardens this year: El Niño. El Niño develops when waters in the central and eastern tropical Pacific become unusually warm. That change can shift the jet stream and influence temperature and rainfall patterns across the U.S.
NOAA's Climate Prediction Center says El Niño is strengthening, with a greater than 90% chance of becoming a very strong event during fall and winter 2026–2027. Its influence is expected to become more noticeable as we move deeper into late fall and winter.
Here is the general picture NOAA is currently forecasting:
South & Southeast: Florida and coastal portions of the Southeast and Gulf Coast are leaning warmer this fall. As winter develops, much of the Southeast shifts closer to near-normal temps, while the chances of above-normal rainfall increase significantly.
Texas, Southern Plains & Mississippi Valley: Rain chances generally increase as El Niño strengthens. Parts of the eastern Plains and Mississippi Valley still have a slight lean toward a warmer-than-normal winter.
California & the Southwest: Fall generally leans warmer, but the chances of wetter conditions increase later in the season. By the core winter months, NOAA favors above-normal precipitation across much of coastal California and into parts of southern Arizona.
Pacific Northwest, Northern Rockies & Northern Plains: These areas generally lean warmer than normal, particularly during winter. Some inland northern areas may also experience drier-than-normal conditions.
Great Lakes & Northeast: The winter outlook leans warmer than normal overall, with the strongest winter warmth favored across much of the northern tier. Parts of the Great Lakes may lean drier, while precipitation chances increase along much of the East Coast later in winter.
One important thing to understand is that warmer than normal does not mean there will not be freezes or sudden cold snaps. Seasonal outlooks describe averages over several months. You could have a winter that finishes warmer than average and still experience a few nights with sharply colder temps.
For gardeners, that means staying prepared for both sides of the weather swing. A stretch of warm weather may keep your garden actively growing and allow pests to remain active longer, only for a cold front to arrive quickly. Keep frost cloth accessible and continue checking your short-term forecast rather than assuming a warm week means winter weather is over.
Stay on Top of Pests and Disease
Changing weather patterns can also affect when pests appear and how long they remain active. Extended warmth may keep caterpillars, aphids, whiteflies, and other garden pests around later than you normally expect. Make a habit of checking the tops and undersides of leaves, stems, and new growth so you can catch problems before they turn into an infestation.
For those of us in areas that may experience increased rain, disease pressure is another concern. Frequent rain, high humidity, and leaves that stay wet for extended periods can create favorable conditions for fungal and bacterial diseases.
This is a good time to focus on:
Good drainage
Proper plant spacing and airflow
Removing diseased or damaged leaves
Watering the soil instead of the foliage when possible
Keeping exposed soil covered with mulch
A 2–4 inch layer of organic mulch, such as straw or shredded leaves, can help reduce soil splash onto lower leaves during heavy rain while also reducing erosion, suppressing weeds, moderating soil temps, and helping maintain more consistent soil moisture. Avoid piling mulch directly against plant stems, and remember that mulch cannot fix poorly draining or waterlogged soil.
The biggest takeaway is to stay flexible. Seasonal forecasts can help us prepare, but your local forecast, soil moisture, pest activity, and the condition of your plants should guide what you actually do in the garden.
3. Decide How You're Going to Plant Your Fall Garden
Once you know your frost date and understand what your weather is doing, the last step is deciding how your fall crops need to get into the garden.
Here is how I want you to use this information today, September 7, 2026:
Start seeds indoors: For slower fall crops such as broccoli, cabbage, cauliflower, collards, and kale, I generally want you thinking about seed starting roughly 10–12 weeks before your first fall frost, with transplants going outside about 6–8 weeks before frost. That means if your first frost is November 16 or later, you may still have time to start these crops from seed now. If you live somewhere with a very late or infrequent frost, such as Central or South Florida, do not count backward from frost alone. Start seeds based on when you expect outdoor highs to settle closer to 75–80°F or below so your seedlings are ready when conditions improve.
Buy transplants: If your average first frost is before November 16, September 7 is getting late for starting slower crops like broccoli, cabbage, and cauliflower from seed for a traditional fall harvest. Instead of losing another month waiting for seedlings to grow, visit your local nursery and look for healthy established transplants. If your frost date is in October or early November, I would especially prioritize transplants now.
Direct sow: For crops that can be planted directly into the garden, work backward from your frost date using the days to maturity listed on your seed packet, plus about 14 extra days because plant growth slows as fall days become shorter and cooler. For example, if you are planting on September 7, a 30-day radish needs roughly 44 days, meaning a first frost around October 21 or later gives you a reasonable window. A 45-day lettuce or spinach variety needs roughly 59 days, taking you to about November 5. A 55-day beet needs about 69 days, or roughly November 15, while a 70-day carrot needs around 84 days, taking you to approximately November 30.
The goal is to make one decision: Do I still have time to start this crop indoors, should I buy the transplant, or should I direct sow it? Your frost date, current temps, and the crop's days to maturity will give you the answer.
This is ultimately what your frost date and current weather are helping you determine. You are not just asking what grows in fall. You are figuring out what makes sense to plant in your garden right now and how you should plant it.
If Seed Starting Is Part of Your Fall Plan...
Starting your own seeds gives you access to more varieties and allows you to get plants growing while you wait for outdoor conditions to improve. But putting a seed into a tray is only the beginning. You also need to understand your growing medium, planting depth, lighting, watering, fertilizing, potting up, common seedling problems, and how to prepare young plants for the transition outside. If this is the part of gardening you want more help with, that is exactly what we are covering in my upcoming Seed Starting 101 virtual class.
This is a 90-minute interactive virtual class where we'll walk through the seed-starting process from planting the seed through preparing your seedlings for the garden. We'll cover growing media, germination, lighting, watering, fertilizing, potting up, troubleshooting common seedling problems, and preparing seedlings for transplanting. Registration is $25, and everyone who registers will receive access to the recording.
Before You Plant This Week...
Labor Day does not mean everyone should be planting the same thing. Your first frost may be a month away, several months away, or barely part of your growing season at all. Your outdoor temps may already be perfect for cool-season vegetables, or it may still feel like the middle of summer.
Use what you learned today to figure out where your garden is in the season. Find your first frost date, check your temps and forecast, then decide whether you should be starting seeds indoors, moving transplants outside, visiting your local nursery, or direct sowing. The goal is to move away from asking, “What should I plant in September?” and start asking, “What can I successfully grow based on the conditions and time I have left?” That is how you begin planning your fall garden around your growing season instead of someone else's.
