A week-by-week watering schedule
This is a typical schedule for sod laid in mild weather. Heat, wind and sandy soil mean more water; cool, cloudy weather and clay mean less. Your sod farm may give its own instructions, and those come first.
| When | How often | How much | Goal |
|---|---|---|---|
| Laying day | As each section goes down, then a long soak | Often about 1 inch total | Soil 3–4 in below the sod is wet |
| Days 1–7 | Daily; 2–3 short sessions on hot days | Enough to keep sod and the soil just below it moist | Roots start growing into the soil |
| Days 8–14 | Daily, or every other day if it stays damp | Slightly more per session, fewer sessions | Sod starts to resist a gentle tug |
| Weeks 3–4 | Every 2–3 days | Deeper waterings | Roots go deeper |
| After about 4 weeks | 1–2 times a week | About 1 in per week, rain included | Normal lawn watering |
How the watering calculator works
Gallons = area (sq ft) × inches of water × 0.623
One inch of water over one square foot is 144 cubic inches, which is 0.623 US gallons. So 1 inch over 1,000 sq ft is about 623 gallons.
Run time (minutes) = inches wanted ÷ sprinkler rate (inches per hour) × 60
Example: a 40 × 25 ft lawn (1,000 sq ft), a quarter inch per watering, and a sprinkler that puts down half an inch an hour:
- 1,000 × 0.25 × 0.623 = 156 gallons each time
- 0.25 ÷ 0.5 × 60 = 30 minutes each time
- Seven waterings a week = 1,091 gallons, 1.75 in
The tuna-can test
You need your sprinkler’s rate to turn inches into minutes. It’s easy to measure:
- Set four to six straight-sided cans (tuna or cat-food cans work) around the area one sprinkler covers.
- Run the sprinkler for 15 minutes.
- Measure the water in each can with a ruler and average them.
- Multiply by 4 for inches per hour. A quarter inch in 15 minutes = 1 inch per hour.
The test also shows dry spots. If one can is nearly empty, that part of the lawn needs a sprinkler moved or an extra pass.
Signs of too little or too much
| Too little water | Too much water |
|---|---|
| Gray-blue or dull color | Soil squishes underfoot |
| Edges curling up, gaps opening at seams | Water standing on the surface or running off |
| Footprints that stay pressed in | Yellowing, mushrooms or a sour smell |
| Pieces lift easily with no roots after 2 weeks | Roots stay shallow because the soil never dries a little |
Edges and corners dry out first, as do pieces next to driveways, walks and walls that soak up heat. Give those spots extra attention.
Watering tips for new sod
- Water early in the morning. Less evaporation and wind, and the grass dries off during the day, which helps keep disease down.
- Start within minutes. On hot days, water each section as soon as it’s laid instead of waiting until the whole lawn is done.
- Avoid runoff. If water runs off before the soil has soaked it up, split the time into two shorter sessions with a break between.
- Stay off it. Keep foot traffic to a minimum for the first couple of weeks; walking on soggy sod leaves dents and breaks new roots.
- Check local rules. Many water utilities exempt new sod from watering restrictions for a few weeks, sometimes with a permit. Ask before you start.
How long until sod roots
Shallow roots often begin within the first week or two in the growing season, and the sod usually holds firm in about two weeks. Deeper rooting takes several weeks. Sod laid in cool weather or late in the season roots more slowly, so keep to the more frequent schedule for longer.
This schedule is a typical starting point, not a rule. Follow your sod farm's watering instructions and adjust to your weather, soil and local water restrictions.
Questions people ask
- How often should I water new sod?
- In the first week or two, usually every day, and on hot or windy days two or three short waterings, enough to keep the soil just under the sod moist. Once the sod resists a gentle tug, cut back to every two or three days, then to about an inch a week including rain.
- How long should I water new sod?
- Long enough to wet the sod and the top few inches of soil beneath it. Time it with the tuna-can test: set out a few cans, run the sprinkler and see how long it takes to collect the amount you want. The calculator converts that into minutes.
- How much water does new sod need?
- Right after laying, a heavy soaking, often around an inch, so the soil below is wet. Then small daily amounts in the first weeks to keep it moist, moving to about an inch a week, rain included, once it has rooted. Your sod farm's instructions come first.
- How do I know if new sod is getting enough water?
- Lift a corner of a piece. The underside and the soil beneath should be damp but not muddy. Gray-blue color, curling edges and gaps opening at the seams mean it needs more; squishy soil and standing water mean too much.
- When can I mow new sod?
- Usually after about two weeks, once the sod has rooted and you can't easily lift it. Let the soil dry a bit first so you don't leave ruts, and take off no more than a third of the blade.