Get the dirt on the right time to test your soil
Fall soil test turnaround time gives you the best results because labs are less busy, and you have time to apply soil amendments before spring planting.
Basic soil testing costs $20 to $100, while more advanced testing for heavy metals or contaminants ranges from $50 to $200 or more.
Soil test results take five days to three weeks to arrive, so plan your testing schedule to leave enough time for soil amendments.
Hiring a local soil testing professional ensures your sample meets local regulations and provides accurate results, especially for septic system perc tests or contamination concerns.
If you’re looking to make the most of your yard, soil testing can be a helpful tool. Soil testing can measure the nutrient levels in your soil, help you cultivate soil that’ll grow healthy grass and plants, and even determine if your yard is suitable for a septic system. But knowing when to soil test can help you get the most useful results. Learn when the best time to soil test is, and how to time your soil test just right based on weather conditions and more.
In most cases, the best time to test soil is in the fall. Weather conditions are optimal, the ground isn’t too wet to collect a useful sample, and the timing is right to formulate a fertilizer and soil amendment plan to give you optimal spring growing conditions. You can test soil throughout the year, but temperature and heavy precipitation can affect the soil sample, and testing too close to the growing season won’t leave you enough time to apply the necessary soil amendments.
Timing a soil test correctly depends on various factors. The condition of the soil due to temperature and precipitation plays a big part, as does the reason you’re testing the soil, but you also want to be able to get timely results from the lab, which is more difficult during certain seasons.
Taking a soil sample from soggy ground can make it difficult to get a good sample and accurate results. Rather than collecting a sample during the rainy season, which for many temperate climates is in the spring and early summer, you’ll want to wait until the bulk of the precipitation has passed in the fall.
Soil testing labs are often busiest in the spring when many homeowners and farmers send their samples for testing. Testing in the fall means shorter wait times, so you can get your results and start planning and applying your soil amendments to give them plenty of time to start working before spring.
It's important to test multiple soil samples from different parts of your property before building. Different areas can have different makeups, so testing in multiple areas can help identify variability in soil conditions.
The reason you’re testing your soil also matters. Unlike a nutrient-measuring soil test, a perc test is a soil test to determine if the composition of the soil can support a septic system. The best time to do a perc test isn’t necessarily in the fall—these tests must be conducted prior to new home construction, so they take place all year long. Failing a perc test can throw a wrench in your construction plans, so it’s best to do these tests early in the building process.
Winter and late spring are the least ideal times to test your soil. Winter soil tends to be dry, cold, and hard, and it can be difficult to collect a good sample. Soil samples from frozen ground don’t give a good representation of the soil’s condition and nutrients, so they’re less useful than samples collected in the fall. Late spring tends to have the heaviest precipitation, which can make collecting a good soil sample difficult. It’s also well into the growing season, so it can be too late to add soil amendments to improve soil conditions.
A lawn soil test costs an average of $20 to $100, and more involved testing that measures things like heavy metals, contaminants, or soil fertility can cost $50 to $200 or more. A perc test can cost an average of $750 to $1,850, depending on local regulations and the size of the potential leach field.
A basic lawn soil test is a straightforward DIY that most homeowners can easily perform. Following the instructions on the testing kit, you’ll collect a sample and then send it to a lab for analysis. If you need to measure ground contaminants or need a soil test before building, contact a local soil testing service to collect and analyze the sample correctly. If you’re installing a septic system, find a soil tester who conducts perc tests to ensure the test complies with local regulations.
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