when to put weed and feed on lawn
You generally put weed and feed on your lawn once in early to mid spring and, if needed, once again in early fall, timed to mild weather when grass is actively growing and weeds are small.
Quick Scoop
- Best seasons: Spring and/or fall, not midsummer or midwinter.
- Typical calendar window:
- Cool‑season regions (northern areas): mid‑April to early June, then late August to mid‑October.
* Warm‑season regions (southern areas): March to early June, then September to early October.
- Ideal temperatures: Daytime between about 60–90°F; avoid heatwaves and freezes.
- Growth stage: Apply only when grass is out of dormancy and actively growing (often after the 2nd mowing).
- Weed stage: Weeds should be present and small, or just starting to germinate, depending on whether your product is pre‑emergent, post‑emergent, or both.
- Frequency: Usually no more than twice a year, with at least 2 months between applications.
Simple timing rule of thumb
- First application: Early spring, right around your first or second mow of the season.
- Optional second: Early fall, when days are cooler again but before your grass goes dormant.
How timing changes by region and grass
| Region / Grass | Spring timing | Fall timing | Key notes |
|---|---|---|---|
| Cool-season lawns (Kentucky bluegrass, fescue, rye) in cooler northern areas | Mid- April to early June, after grass greens up and you’ve mowed at least twice. | [1]Late August to mid-October, while days are cool but grass is still actively growing. | [1]Avoid feeding later than early June so grass can handle summer stress. | [1]
| Transition zone (mix of cool- and warm-season grasses) | Cool-season: early April–mid-May; warm-season: mid-April–early June. | [1]Cool-season: mid- September–early November; warm-season: September, before dormancy. | [1]Watch local frost dates, and stop once warm-season grass starts to go dormant. | [7][1]
| Warm-season regions (Bermuda, Zoysia, St. Augustine, etc.) | March to early June, after the lawn has clearly greened up. | [1]September to early October. | [1]Do not apply while the lawn is transitioning out of winter dormancy; wait for solid green. | [1]
Weather and time‑of‑day matters
- Temperature: Aim for a stretch of days with highs between 60–90°F; avoid cold snaps and extreme heat.
- Moisture: Lawn should be slightly moist so granules stick (dew or a light watering), but no heavy rain is forecast in the next 24–72 hours, depending on the label.
- Wind: Choose a calm, mild day so granules don’t blow away and you don’t drift herbicide onto beds or sidewalks.
- Time of day: Many guides recommend early morning (with dew) or late afternoon/early evening to avoid hot midday sun that can burn fertilized grass.
When you should NOT put weed and feed on
- When grass is dormant (still brown from winter or fully dormant in summer).
- During a heatwave or drought, or when temperatures are above about 90°F.
- Right before or during heavy rain, which can wash product away and increase runoff.
- On a newly seeded or newly sodded lawn until you’ve mowed at least 2–3 times (about two months).
- More often than the label allows (commonly no more than twice per year with at least 2 months between treatments).
Different viewpoints (forums vs. experts)
- Many lawn care pros suggest using separate fertilizer and weed control instead of combo weed and feed so you can time each one perfectly and reduce overuse of herbicides.
- Some university extensions warn about “weed and feed dilemmas,” like potential herbicide damage to warm‑season grasses if applied as they leave dormancy.
- Homeowners on forums often say they like one spring weed and feed if the lawn has plenty of grass but visible weeds, applied on a dewy morning and then watered in afterward.
A practical example: if your lawn has already greened up, you’ve mowed twice, daytime highs sit in the 60s–70s, and you see dandelions popping, that’s a good moment to apply weed and feed—then skip any second treatment until early fall, if you still need it.
Information gathered from public forums or data available on the internet and portrayed here.