DELHI NCR · 12 MONTHS · UPDATED EACH SEASON
Delhi NCR pest calendar: which pests come in which month.
In Delhi NCR, termites swarm after the first rains and stay busy through the monsoon (July to September), dengue mosquitoes climb from July and peak from late August to November, cockroaches and ants are most active in summer, and rats move indoors from December to February. Pick a month to see what's active, why, and what to book.
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Pest by pest: the months to watch
| Pest | Busiest months | Why | Book |
|---|---|---|---|
| Termites | Swarms after the first rains; July to September | Winged termites leave the colony after rain, and soil-dwelling species work up into wood through the damp months | Termite inspection before the rains, or as soon as you see wings |
| Mosquitoes (dengue) | Rising from July; dengue peaks late August to November | Monsoon water fills coolers, pot trays and drains, where larvae grow | Mosquito control in mid to late August; fogging for lawns and grounds |
| Cockroaches | Summer, and all year in towers | Warm, dark gaps near food and water; shafts and drains link flats | Cockroach control or general pest control every 3 months |
| Ants | Summer | Trails to sugar and food stores | Ant control or general pest control |
| Rats and mice | Indoors December to February | They come in for warmth and food when it gets cold | Rat control before winter; seal gaps before the monsoon |
| Houseflies | Monsoon | Warm, humid weather speeds up breeding in wet waste | Housefly control, and covered bins and drains |
| Silverfish | Monsoon | They need very high humidity, which the monsoon gives | Silverfish control and a drier room |
| Lizards | Summer, and again after the monsoon | They follow the insects they eat | Lizard control before summer and after the monsoon |
| Carpet beetles | Found when woollens come out for winter | Larvae feed for months on wool and silk in dark storage | Carpet beetle control; store woollens clean and sealed |
| Bed bugs | Any month | They travel in luggage and second-hand furniture | Bed bug treatment, two visits |
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January to March: rats indoors, smog dust, woollens away
| Month | Most active | Why | What to book |
|---|---|---|---|
| January | Rats and mice indoors; fine smog dust on every ledge | Cold nights push rodents in through kitchen ducts, drains and door gaps; the smog season runs November to January | Rat control; a Home Refresh with a balcony clean for grills and window tracks |
| February | Rats still indoors; woollens going back into storage | The rodent season runs to February; stained woollens are the ones clothes-moth larvae damage most | Rat control follow-up; carpet beetle control if woollens showed holes this winter; pack them away clean and sealed |
| March | Lizards, ahead of their summer peak; Holi colour on floors and sofas | Insects, and the lizards that eat them, build up before summer | Lizard control before summer; a deep clean after Holi; a termite inspection if you saw wings last monsoon |
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April to June: tanks, cockroaches and the heat
| Month | Most active | Why | What to book |
|---|---|---|---|
| April | Cockroaches and ants, the summer pests; algae starting in roof tanks | Summer heat speeds up algae in tanks, and April is the month before it | Tank cleaning (one of the two best months); a deep clean before the windows close and the ACs run all day |
| May | Cockroaches, ants and lizards, in the peak summer months; tanker top-ups | May and June are the hottest months (45°C and above is common); many colonies in Faridabad, Gurugram and Ghaziabad rely on tankers when supply falls short | Cockroach or general pest control; tanks on tanker water every 3 months |
| June | Cockroaches and ants; rodents looking for gaps before the rains | Health authorities advise sealing gaps against rodents before the monsoon, when leptospirosis cases rise | Rat control and gap-sealing; a termite inspection before the rains; fogging rounds booked for the season |
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July to September: monsoon, termites and mosquitoes
| Month | Most active | Why | What to book |
|---|---|---|---|
| July | Termite swarms; mosquitoes climbing; houseflies and silverfish | The monsoon (July to September) brings the first rains, damp walls, wet waste and standing water | Termite treatment if you've seen wings or mud tubes; housefly or silverfish control; weekly fogging for society grounds |
| August | Mosquitoes rising fast; dengue cases start to climb late in the month | Water collects in coolers, pot trays, AC trays and construction pits; by mid-September 2024, Faridabad's cases had risen more than 160% in a month, which officials linked to stagnant rainwater | Mosquito control in mid to late August, before dengue season; the weekly water check |
| September | Dengue near its peak; silt in tanks and sumps | Delhi recorded 286 of its 695 dengue cases to 3 October 2026 in September alone; monsoon rain washes sediment into the supply, and rainwater gets in through old sump lids | A second mosquito round if spots keep refilling; tank and sump cleaning after the monsoon; pre-Diwali deep-clean slots open 15 September |
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October to December: dengue peak, Diwali and winter
| Month | Most active | Why | What to book |
|---|---|---|---|
| October | Dengue still at its peak; lizards active again; woollens coming out | Cases peak in September and October; Gautam Buddh Nagar (Noida) had 207 cases from January to 1 October 2026; in Noida and Ghaziabad the Upper Ganga Canal closes for its annual cleaning in October, so societies run on groundwater and tankers | Mosquito control or fogging; lizard control after the monsoon; tank cleaning before or after the canal closure; a deep clean 7 to 10 days before Diwali |
| November | The last weeks of dengue season; smog season begins; rat-proofing before December | Diwali falls on 8 November 2026; the dengue season runs into November; fine dust settles on fans, grills and window tracks | Diwali deep clean (book 2 to 3 weeks ahead); cleaning up diya oil and wax after the festival; carpet beetle control if woollens show holes |
| December | Rats and mice indoors; smog dust | Rodents come in for warmth from December; in Gurugram, doctors say the dengue season can run to mid-December | Rat control; a Home Refresh with a balcony clean; plan next year's visits |
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Any month of the year
Some jobs don't follow the seasons.
- Bed bugs arrive with a suitcase, a hostel stay or a second-hand bed, in any month. Unpack on a hard floor after a trip and wash travel clothes hot. Bed Bug Control →
- Cockroaches in towers move between flats through kitchen and bathroom shafts all year, which is why treatment every three months works better than one visit a year. General Pest Control →
- Wood borer larvae tunnel inside furniture for months before the holes and powder appear; book a free inspection whenever you see fresh powder. Wood Borer Treatment →
- Bee hives can return to the same ledge in the same season; send a photo whenever one appears. Honey Bee & Wasp Hive Removal →
- Bird nets take a beating from sun, wind and monsoon storms; check the edges after every storm. Bird Control & Netting →
Pest calendar questions
Which month do termites come in Delhi?
Winged termites swarm after the first rains, and termite activity rises through the monsoon, July to September. Piles of identical wings near windows or lights after rain are the sign to look for. Book an inspection before the rains if you saw wings or mud tubes last year.
When is dengue season in Delhi NCR?
Mosquito numbers climb from July as the monsoon fills coolers and pots. Dengue cases rise from late August, peak in September and October, and carry on into November. Book mosquito control in mid to late August, and keep emptying standing water every week.
Which month are cockroaches worst?
Summer. In towers they also move between flats through shafts and drains all year, so a treatment every three months keeps them down better than a single visit.
When do rats come into the house?
Mostly in winter, from December to February, looking for warmth and food. They get in through kitchen ducts, drains and gaps under doors, so close those as well as booking rat control.
When is the best time to clean the water tank?
April, before summer heat speeds up algae, and September, after the monsoon washes silt into the supply. Tanks topped up with tanker water need cleaning about every 3 months. How often to clean your tank →
Is pest control in the monsoon a good idea?
Yes, for the pests the monsoon brings: termites, houseflies, silverfish and mosquitoes. Indoor treatment goes ahead as normal; soil treatment isn't done in rain or on waterlogged ground, and outdoor fogging waits for a dry, still evening.
Kaun se mahine mein kaunsa keeda zyada hota hai?
Garmi mein cockroach aur cheenti, baarish (July se September) mein deemak, makkhi aur silverfish, August ke end se November tak dengue ke machhar, aur sardi (December se February) mein chuhe ghar ke andar aate hain.
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