Practical guides for your home systems, pool, lawn and garden. Each one gives a direct answer first, then the dates and numbers for your climate.
49 guides · updated weekly
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Get cool-season seed down before the top 2 inches of soil reach 50°F, and wait for 65°F soil for Bermuda grass. Typical dates for 48 US cities from NOAA’s measured soil temperatures and climate normals.
A last frost date is a probability, not a deadline. What NOAA’s 10%, 30%, 50% and 90% dates mean, and a test of how often they held up at 967 airport stations.
One label shock dose adds about 5–10 ppm free chlorine. Label doses for liquid chlorine, cal-hypo, dichlor and non-chlorine shock, SLAM levels by stabilizer, and the CYA that weekly dichlor adds by city.
Dormant seed a cool-season lawn once normal afternoon highs fall below about 40°F, and stop when they climb back. Winter windows for 23 Northern US cities from NOAA normals, checked against extension advice.
Gas tankless beats a minimum-efficiency tank by $90–$210 a year but an ENERGY STAR tank by only $18–$42, and its flow drops with cold winter water. Estimates for 22 cities.
Cool-season lawns stop growing when daytime highs stay below about 50°F; warm-season lawns stop at the first frost. Normal-year dates for 40 US cities, checked against extension advice.
Frost is ice on surfaces; a freeze is air at 32°F or colder. NWS alerts explained, and NOAA data on how each threshold changes your growing season.
Answers: what planting zone am I in?
Answers: what size generator do I need?
Answers: how much salt do I add?
Answers: when is my last frost?
Most lawns need about 1 inch of water a week, rain included. How often to water, how long to run a sprinkler, and how much normal summer rain covers in 21 US cities.
Cool-season grasses grow best at 60–75°F highs, warm-season grasses at 80–95°F. Three identification checks, the transition zone, and prime growing weeks for 24 cities from NOAA normals.
Your zone measures winter’s coldest night; your frost dates time your planting. Across 38,384 ZIP codes, frost dates inside one half-zone still differ by weeks.
Free chlorine 2–3 ppm, pH 7.4–7.6, alkalinity 80–120 ppm, calcium 200–400 ppm, stabilizer 30–50 ppm: every range tied to CDC or a manufacturer’s manual.
Plant tulips as fall nights cool from 50°F to 40°F, finishing around your first frost. Dates for 24 cities, checked against 16 extension calendars, plus warm-winter chilling.
Core-aerate cool-season lawns in late summer to early fall and warm-season lawns in late spring to summer. Windows for 27 cities from NOAA normals, checked against extension calendars.
Outdoors only, 20 feet from the house, exhaust away, CO alarms on every level. CPSC records of 789 generator CO deaths show why each rule exists.
Cover tender plants at 36°F on clear, calm nights and always at 32°F; below about 28°F covers stop working. Thresholds, NWS alerts, how to cover, and fall frost dates for 24 cities.
Cold-climate heat pumps keep at least 70% of their capacity at 5°F. How cold 21 US cities get, from NOAA normals and design temperatures, plus field results.
Plant garlic in the two weeks either side of your first fall frost. Dates for 22 US cities from NOAA normals, checked against 11 local extension calendars.
Count back from the day each crop goes outside, not from the last frost. A sourced crop chart plus seed-starting dates for 20 US cities from NOAA normals.
A heat pump beats a gas furnace on running cost only when its COP tops a break-even set by your rates. Estimates for 20 cities, the formula, and a lookup table.
Apply crabgrass preventer when the top two inches of soil hold about 50–55°F. Typical windows for 22 cities from NOAA normals, checked against extension dates, plus Southern timing.
Cool-season lawns get their main feeding in early fall; warm-season lawns are fed after green-up and stop six weeks before frost. Schedule, bag math and dates for 20 cities.
Close once the water stays below 65°F, or 60°F to be safer, and before freezing nights. Estimated dates for 46 cities from NOAA climate normals.
Plant tomatoes once frost risk is low and nights reach 50°F, usually 3–4 weeks after the average last frost. Dates for 26 cities from NOAA normals.
Finish overseeding at least 45 days before your first hard freeze. Dates for 21 cities, checked against extension advice, plus your own ZIP.
Get a short email when it’s time to overseed, start seeds, open the pool or service your furnace — timed to your climate.
