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Most gardening advice starts in spring. And while that does make sense, there is another approach that gardeners might find more useful when it comes to actual harvesting. There is often a rush of vegetables to be harvested in July and August, followed by a sharp drop in September. And then by early fall, the garden beds are empty or filled with declining plants. There is a different strategy, though, that changes that pattern. Instead of starting with spring planting dates, gardeners can begin with their desired fall harvest and plan in reverse.
This method, sometimes called “gardening backwards,” treats the growing season like a timeline. The key anchor point is the average first fall frost date. In many parts of the US, this happens sometime between late September and late October. You can check with local extension offices and weather services that publish average frost dates for specific regions. While the weather does vary each year, these averages are a useful planning tool.
How To Garden Backwards
Once you know the expected first frost date, the next step is to decide what you want to harvest in September and October. Cool-season crops are usually the best options, like lettuce, spinach, kale, carrots, beets, radishes, broccoli, and cabbage. These vegetables can tolerate a light frost. In fact, some even improve in flavor after they’ve been frost-bitten. Warm-season crops like beans or cucumbers, on the other hand, will die at the first hard frost. When you plan backward, you decide when to plant each crop so it reaches maturity at the right time.
On every vegetable seed packet is a “days to maturity.” This number estimates how long it takes from planting to harvest under normal conditions. For example, a lettuce variety might mature in 45 days. Bush beans might take 55 days. Carrots may need 70 days.
The Math
Now, if you want fresh lettuce in early October, and the average first frost is October 15, this is how to calculate when to plant. Counting back 45 days from October 1 puts the planting date in mid-August. That means the last sowing of lettuce should happen in August. Of course, you can plant some sooner (and you should!), but to be sure you have late-season lettuce, new seeds need to be planted in mid-August.
Here’s another example: If bush beans take 55 days to mature and the first frost is October 15, the last planting should occur by mid-August to allow harvest before frost damage. Again, you should plant some earlier, too, but if you want fresh beans later in the season, don’t skip the August planting. A second or third planting, timed correctly, extends the harvest into early fall.
Succession Planting
This method goes hand in hand with succession planting. Succession planting is planting crops at intervals rather than all at once. Instead of planting one large bed of lettuce in April, a gardener might plant small sections every two or three weeks.
Factors To Consider When Planning a Backwards Gardening Approach
One big issue that could be a problem is not taken into consideration is that plant growth will slow as daylight decreases in late summer and early fall. After the fall equinox, your plants receive fewer hours of sunlight each day. As a result, the “days to maturity” listed on seed packets will need some adjustment.
For example, a crop planted in September may take longer to mature than one planted in June. To counter this, many gardeners often add one or two extra weeks to account for slower growth when calculating late-season plantings.
Another thing to consider when choosing plants is frost tolerance. Hardy crops such as kale, collards, and Brussels sprouts can survive several frosts and sometimes remain harvestable into November. Tender crops like basil and cucumbers cannot. So, while you may want basil in November, it’s not always possible. When working backward, research which crops can extend beyond the first frost and which must be harvested before it.
Benefits of Gardening Backwards
Gardening backwards changes how spring is viewed for many gardeners. Instead of planting everything as soon as possible, you can evaluate which crops truly need early planting and which are better saved for later. Peas and onions belong in early spring, for sure. And, so do cool-season greens. But not every seed must go into the ground in April or May. Some crops, especially those intended for fall, are better planted months later.
The plant-everything-immediately approach produces the common “summer glut,” when too much ripens at once. There is often a flood of zucchini, beans, and tomatoes in July. However, with more planning, the harvest can be spread out. A second planting of beans in midsummer or a late sowing of carrots in July shifts some production into September. Instead of scrambling to preserve excess vegetables in midsummer, you can enjoy a steadier supply over a longer period.
This method, of course, does not eliminate any problems from happening. The weather can still surprise us (and it often does!). Your seeds may germinate unevenly. Pests might wreak havoc and cause all kinds of issues. Yet working backward from the fall harvest increases the likelihood of success.