Bermudagrass Lawn Care Calendar for Oklahoma

Nitrogen for the Season

Aim for about 3 lbs of nitrogen per 1,000 sq ft across the year, and treat 4 lbs as the ceiling where risk of excess growth and thatch starts to climb. Split that total across the spring green-up feeding, the two summer applications, and the low-nitrogen fall potassium application rather than pushing it all into one pass. Confirm the actual product rate on the label — this budget is a season total, not a per-application number.

Mowing Height by Season

Keep bermudagrass in the 1" to 2" band through spring, summer, and fall, targeting about 1½" as the sweet spot for density without scalping. Never remove more than one-third of the blade in a single mow; if the lawn has gotten away from you, step the height down gradually over two or three cuts instead of scalping it back in one pass.

At spring green-up, one low reset cut down to about 1" can clear out last year's dormant thatch and speed things along — but this is a one-time move, not a routine height. Bag the clippings from that cut, then return to the normal 1"–2" range for the rest of the season.

The Season Timeline

Pre-emergent herbicide goes down as soil rises to about 55°F, typically in the March 11 to April 8 window, to get ahead of summer annual weeds before the lawn fills in. Spring green-up fertilizer follows once soil holds above 65°F and the lawn shows roughly 50% green-up, generally April 16 to May 14.

If you're renovating or filling in bare spots, the early-summer seeding window — May 14 to July 9, once soil is reliably in the 65°F to 70°F range — is the one shot for bermudagrass. It gives a full growing season to establish before dormancy; bermudagrass should not be seeded in fall.

Summer fertilizer runs in two passes: a peak-growth feeding roughly May 30 to July 11, and a second application from July 15 to August 26 as the last heavy nitrogen before the fall transition. Spring core aeration fits in late spring, April 29 to June 10, once the lawn is actively growing.

A few narrower windows round out the calendar. Broadleaf weed control, if needed, targets actively growing weeds from about May 6 to June 23, using a post-emergent labeled for your grass — avoid applying above roughly 90°F or under drought stress, and confirm the label lists bermudagrass. A grub preventive, if your lawn has a history of grub damage, needs to go down and be watered in during the May 16 to June 27 window, before eggs hatch — most lawns never need this, so scout for damage first. A wetting agent can help dry patches take up water through the heat from roughly May 21 to July 20. Fall potassium — a high-K, low-N application — supports cold hardiness from about August 23 to October 4, and a fall pre-emergent for winter annual weeds like annual bluegrass, henbit, and chickweed goes down as soil cools through about 70°F, roughly August 28 to October 3. An annual soil test in early fall, July 27 to October 25, is worth doing while the grass is still active so results can guide lime and nutrient decisions.

Watering

Aim for about ¾" of water a week, split into two deep soakings of about ½" each, early in the morning. Watering deep and infrequent encourages roots to grow downward, and morning timing lets the lawn dry out before night, since wet grass overnight invites disease. In sustained heat, that weekly target rises — by about a quarter inch when highs sit near the mid 80s, up to about a half inch when three or more days push near 90 — capped there so the soil can absorb it without runoff.

Timing Conflicts to Watch

A few product categories interact with seeding on a timing basis, not an event basis — the rule is about spacing, not about anything you've necessarily done. If you've recently applied a broadleaf herbicide, wait about 6 weeks (42 days) before seeding. If you've recently put down a crabgrass pre-emergent, wait about 12 weeks (84 days) before seeding, since that product is designed to stop germination and will work against new seed just as effectively as it works against weeds. When in doubt, check the label of whatever was applied for its own replanting interval before seeding bermudagrass.

Gear this schedule assumes

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Rain gauge

Any $10 gauge works. You need it to hit the 0.75 in/week target above without guessing.

Soil thermometer

The seed and pre-emergent windows above are soil-temperature windows — a $15 probe beats calendar guessing.

Broadcast spreader

Needed for even fertilizer and seed rates. A basic rotary spreader covers most lawns.

Oscillating sprinkler + hose timer

Enough to water deeply and consistently if you have no in-ground system.

Smart irrigation controller

Only if you have an in-ground system — a Rachio-style controller automates the watering schedule.

None of this replaces the product label in your hand — it governs rate, timing, and what grass types it's cleared for. Use these windows to plan the season, and let soil temperature, not the date on the wall, tell you when to act.

More guides

Bermudagrass in other states

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