How to Build a Seed-Starting Calendar That Actually Works

By Ashleigh Smith for True Leaf Market

There are a million ways to build a seed-starting calendar, but not every method works well. Do you start with your last frost date, zone, or days to maturity? When should you start indoors? Or should you just direct sow? Should you use an old-fashioned notebook or a fancy AI tool? Here, we are going to outline the best way to build a seed-starting calendar that will carry you from sowing to harvesting for a successful season of growing.

How to Track Your Garden All Season Long

The best way to track what is going into your garden and how it performs really depends on what kind of tools you are used to using in day-to-day life. If you are familiar with AI tools, that may be the best option for you. But if you lean more towards traditional digital tools like spreadsheets and databases, a good ole spreadsheet may be the perfect fit. This option is especially great for individuals who want to track progress from year to year, enjoy testing new varieties, or who are tracking multiple data points like weather, harvest size, frost dates, etc. If you are not too concerned with tracking much data and just want to manage a smaller home garden, a traditional notebook may be the right fit.

Step 1: Identify What You Can Manage

One of the biggest pitfalls of home garden planning is not starting with what you actually have available. The first step to building a seed-starting calendar that actually works is knowing how much space you have to work with, what tools you already have, and what time you have to work with. These key pieces of information will help you avoid overplanting and becoming overwhelmed throughout the season.

Start by identifying what your final growing space will look like. Are you growing in raised beds, containers, or a traditional in-ground garden? Take measurements if you don’t already know what your growable space is. Identify any spaces you plan to use to expand your garden and the tasks associated with the expansion. These tasks will need to be worked into your garden plans so they are completed in time to plant or transplant.

Next, identify what your seed-starting space looks like. Do you have a dedicated indoor growing space, or some spare counter space for a tray or two? Knowing what you can manage indoors will come in handy once you are ready to decide what to start indoors and what to plant directly outdoors. Take note of any grow lights and seed-starting supplies you already have. Consider if there is anywhere you could expand your space if needed. Your available outdoor growing space, seed-starting space, and growing supplies should all be recorded in your chosen tracking medium to reference later on.

Step 2: Selecting the Right Plants For Your Garden

The best garden is one that produces the harvest you are most likely to use. It can be easy to get carried away with selecting fun new fruits and vegetables to grow. By prioritizing the things you use most, you are more likely to actually consume your harvest and waste less. Create a list of fruits and vegetables you and your family use most in your day-to-day cooking. I like to separate these ideas into everyday essentials, 1-2 times a week, and every once in a while lists. This will help you to dedicate growing space according to your most needed crops.

Step 3: Setup Your Seed-Starting Calendar

Using your chosen tracking method, create a column for crops, days to maturity, number of plants needed, transplant date, weeks to be grown indoors, seed starting date, direct sow date, and notes on planting depth and spacing. You will end up leaving some of these spaces empty depending on the crop. This can easily be done in a notebook. If you are interested in gathering additional information, such as precipitation, late-season frost, harvesting notes, or other data, I recommend using a spreadsheet program.

Now you are ready to start filling in information as you select each crop you want to grow. In addition to your list of key growing information, it can be helpful to create a mock-up of your growing area. Using the measurements you gathered earlier, either create a paper and pencil outline or build your growing space in your spreadsheet on its own tab. Programs like Hortisketch can be helpful to create a detailed plan and plant list.

Using the everyday essentials list of crops you created earlier, start penciling in your garden. Try to dedicate at least 50-60% of your growing space to the crops you will regularly use. Then move to your 1-2 times a week list to fill in 20-30% of your space. And end with 10-20% of your space for plants that are of particular interest to you, but may not be something you frequently use. Every time you pencil in a plant, consider its mature dimensions. This is key to avoiding overcrowding and poor air circulation that can lead to pest or disease issues later in the season.

Step 4: Record Your Seed-Starting and Planting Dates

I recommend holding off on this step until you have worked out your mock-up, as your plans are likely to change once you can visualize the mature size and the number of crops you use in your day-to-day cooking. For each crop you decided to add to your garden, record the crop name, days to maturity, number of plants needed, and the planting information as it relates to each crop in your notebook or spreadsheet. Some crops are best sown directly, while others need to be started indoors in a more controlled environment. For seeds that are often started indoors and later transplanted, the days to maturity will usually reference the days until you can gather a harvest after being transplanted.

While seeds are generally available in your local grocery store during the spring season, a much larger selection is available online, including many All America Selections winners, which are awarded for their incredible performance. True Leaf Market is known for its premium selection of over 3,000 varieties for home gardeners. For help finding seeds that perform well in your zone, try our seed finder tool!

How to Determine Your Seed Starting And Transplant Dates

Many people mistakenly think their planting dates are determined by their zone. However, this is incorrect! Planting dates and last frost dates vary widely within zones because frost dates are heavily influenced by microclimate factors such as elevation and humidity. Hardiness zones are only determined by the average lowest temperature. They do not take into account when your first and last frost dates are, or the time between them.

Your most important piece of information when selecting your planting dates is your average last frost date. Local extension services or news channels will often report these for each city in your area. This date is the last spring frost expected in your area. Most of your warm-season plants such as tomatoes, eggplant, peppers, and squash will need to be transplanted or directly sown after your last expected frost. Cool-season crops like peas, broccoli, cauliflower, and leafy greens can be planted before. Just be sure to research how much earlier they can be directly sown or transplanted.

Be sure to record the seed-starting date for those crops that need some extra time indoors with a controlled environment. To identify the seed starting date, count back the number of weeks they need to spend indoors from your intended transplant date. Warm-season crops should be transplanted after your last frost date, while cool-season crops may be transplanted earlier. The week you land on is when they should be planted indoors. For each crop, also be sure to record the planting depth and spacing in the notes section for each line.

If the days to maturity for a crop exceed the number of days between your last spring frost and expected first fall frost dates, you may not be able to grow it in your area. If this number is close to the number of days in your growing season, you may be able to use season-extending tools such as cold frames, cloches, winter grow tents, or hoop houses to make it work.

Step 5: Compile Your Garden Calendar

Finally, compile each seed-starting date, transplant date, and direct-sow date into a calendar. If you are using a spreadsheet, this can be created on another tab within the same workbook you have added your mock-up, planning, and crop information. Once those dates are recorded, you may want to highlight a range of potential harvesting times for each crop. Keep in mind the days to maturity are approximate. Crops are likely to be ready for harvesting within a week before or after the listed number of days.

Grow Your Best Garden Yet

By following these steps, you can rest assured that your garden is planted on time and contains the crops that best suit your cooking styles. Whether you are planning a small container garden or several acres, this plan will help you grow successfully.

About the Author:

Ashleigh Smith is the Managing Editor at True Leaf Market with a bachelor's degree in Horticulture from Brigham Young University - Idaho. True Leaf Market is a nationally certified organic, non-GMO seed and horticultural company based in Salt Lake City, Utah. The True Leaf Market staff specializes in supplying a large selection of conventional, heirloom, and organic seeds to home gardeners everywhere. Learn more about our seeds, supplies, and other growing ideas: www.trueleafmarket.com.

All articles are copyrighted and remain the property of the author.

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