"Flea and tick season" sounds like one stretch of summer. In the Carolinas and Virginia it's really several overlapping seasons. Each tick species and life stage peaks in a different month, and fleas often rebound in fall. Here's when each one peaks according to field research in our states, what the local disease numbers say, and what prevention actually works.
Ticks peak from late spring through summer: lone star adults in May and June, nymphs in June and July, and swarms of tiny larvae ("seed ticks") in August. Blacklegged (deer) tick adults are active from late fall through winter in the Southeast. Fleas build through the warm months and often rebound in fall.
So there's no truly safe month. The veterinary parasite council (CAPC) recommends year-round flea and tick prevention for pets.
The Flea and Tick Calendar for SC, NC and VA
| Months | Ticks | Fleas |
|---|---|---|
| Dec to Feb | Blacklegged (deer) tick adults are active through winter in the Southeast | Low outdoors, but indoor infestations carry on in a heated house |
| Mar to Apr | Lone star ticks wake up. SC's survey recorded its first collection peak in late March | Activity starts climbing from the Gulf Coast northward |
| May to Jun | Peak tick months. Lone star adults peak in May and June, and SC's survey peaked again in early to mid June | Rising |
| Jul to Aug | Lone star nymphs in June and July, then larval "seed tick" swarms in August | High, though extreme heat and dry spells can cut flea survival outside shaded spots |
| Sep to Nov | Lone star larvae linger. Deer tick adults return as it cools | Fleas often rebound in fall |
Tick timing comes from a 2009 to 2018 study of lone star ticks in southeastern Virginia (Old Dominion University), South Carolina's statewide tick survey, and a 2025 CDC review of blacklegged tick seasons. Flea timing comes from a 2024 national flea activity model. Full sources are below.
Ticks: Which Ones and Where
For tick identification and photos, see our guide to the types of ticks in South Carolina. Here's what the local survey and case data show.
- The lone star tick dominates. South Carolina's statewide program sampled ten sites, mostly state parks, from the mountains to the coast in 2020 and collected 3,674 ticks waiting for a host. 98.1% were lone star ticks, with the highest densities on the southern coast. Only 53 were blacklegged ticks and 7 were American dog ticks.
- Hampton Roads is tick country. The Old Dominion University study flagged Chesapeake, York, Portsmouth and Northampton as areas of elevated lone star tick abundance, and found more ticks in wooded habitat than in grassy areas.
- Lone star ticks travel in numbers. ODU tick researcher Holly Gaff points out that all life stages feed on people, and "when you find one you'll often find lots of them". The August larvae hatch in clusters, which is why people on Reddit describe walking into a "tick nest" and finding hundreds on their legs from the knee down.
- They can seem to disappear and come back. Gaff notes they live several years and can go months between meals. They "feel like they've disappeared but they really are always around."
What the local disease numbers say
| State | What the data shows |
|---|---|
| North Carolina (2024) | Ehrlichiosis, spread by lone star ticks, was the most reported tick-borne disease: 278 cases, nearly a quarter of them hospitalized. Lyme disease: 247 cases, concentrated in the northwestern mountains (Yancey, Mitchell, Madison, Alleghany, Ashe). Spotted fever rickettsiosis: 195. Most cases began in summer. |
| South Carolina | From 2013 to 2017, 74% of human vector-borne disease cases were tick-borne, and spotted fever group rickettsioses alone made up about half (47%) of all cases. Lyme is uncommon but rising in the Lowcountry, from 1.1 to 4.1 cases per 100,000 people between 2014 to 2018 and 2019 to 2023. |
| Virginia and NC | The CDC's 2023 alpha-gal report found the highest rates of suspected cases of this tick-linked red meat allergy in a band of states that includes North Carolina and Virginia. The lone star tick bite is the main known cause. |
How fast a tick can make you sick
The old advice that a tick needs "a day or two" to pass on disease holds for Lyme, but not for every tick-borne disease. The CDC says a blacklegged tick generally has to be attached for more than 24 hours to transmit Lyme bacteria. Spotted fever is faster. A CDC study in guinea pigs found American dog ticks passed live Rickettsia rickettsii, the cause of Rocky Mountain spotted fever, in less than 4 hours. Check yourself, your kids and your pets the same day you've been outside, not the next morning. Our tick removal guide covers what to do when you find one.
Fleas: Why Fall Is a Second Season
The cat flea (Ctenocephalides felis) is the flea on almost every dog and cat here. The adult stays on the pet, but the rest of its life happens on the ground or the carpet. According to the University of Florida, larvae need at least 75% humidity and temperatures from 70°F to 90°F, in spots protected from sun, rain and sprinklers. The whole cycle takes 30 to 75 days.
That explains the shape of the season. A 2024 flea activity model published in Parasites & Vectors found that Southern summers are favorable overall, but "extreme heat and lack of humidity" can cut how long fleas survive outside shaded, protected spots. For much of the eastern US, the model shows "a fall flea resurgence that can last from early October to late November". It doesn't single out the Carolinas or Virginia, but if you stop prevention when summer ends, you may stop right before a rebound.
Why indoor fleas take weeks to clear
The University of Kentucky's flea guide explains the problem. A female lays 40 to 50 eggs a day, and they fall off the pet into carpet and furniture. The pupae sit in cocoons that insecticides can't get through, usually for 1 to 4 weeks, and longer in an empty house, which is why people get bitten when they move into a vacant home or come back from vacation. Vacuuming helps twice. It removes eggs, larvae and pupae, and the vibration triggers adults to come out of their cocoons sooner, where treatments can reach them.
Owner accounts on Reddit fit this pattern. One owner who moved out for a week, vacuumed daily and had the house treated twice reported it "took us 10 weeks." Another had a home "professionally treated 3 times" with fleas still coming back, and the top reply asked whether the crawl space had been treated, a spot that's easy to miss. A third stopped counting bites at 120.
Protecting Pets
- Keep prevention going year-round. CAPC, the veterinary parasite council, recommends year-round, broad-spectrum parasite control and makes the case for "year-round, lifelong" flea and tick protection. Ask your vet which product fits your pet.
- Check after every outing, especially ears, neck, armpits, between the toes and around the tail. Checking on the porch or in the garage keeps a loose tick out of the house.
- Prevention cuts risk but doesn't eliminate it. In one popular Virginia thread, the top answer came from an owner whose dog was diagnosed with Lyme despite being on a preventive. Daily checks still matter.
- Don't stop in September. Fleas often rebound in fall.
Making the Yard Less Hospitable
- Mow, clear leaf litter and cut back brush around the house and lawn edges, as the CDC recommends. Ticks wait in leaf litter and tall growth, not short, sunny lawn.
- Put a 3-foot strip of wood chips or gravel between lawn and woods. The CDC says it restricts tick migration into play areas.
- Treat where pets rest, not the whole yard. Flea larvae live in shaded, protected spots. The University of Florida calls spraying the entire yard "wasteful and irresponsible". Target shade under decks, along foundations, crawl space entries and favorite pet spots.
- Move woodpiles and bird feeders away from the house. They draw rodents and wildlife that carry ticks and fleas.
Treating Inside the House
- Treat every pet at the same time, with a vet-recommended product.
- Vacuum daily during an infestation, focusing on pet resting spots, baseboards and under furniture. Empty the canister or bag outside.
- Wash pet bedding in hot water every week.
- Use an insect growth regulator (methoprene or pyriproxyfen) on carpets and upholstery to stop eggs and larvae from developing.
- Keep going for several weeks. Adults keep emerging from cocoons for 1 to 4 weeks after treatment, so seeing a few fleas after a treatment doesn't mean it failed.
For the full process, see how to get rid of fleas.
When to Call a Professional
- You've treated the pets and the house consistently for a month and still see fleas
- You have a crawl space, or fleas are coming from under the house
- You keep finding ticks on pets or family members from your own yard
- Your yard backs onto woods, which is common across Hampton Roads and the Lowcountry
Our flea and tick control service targets the shaded resting areas, brush lines and crawl space entries where fleas and ticks actually live, rather than blanket-spraying the yard.
Key Takeaways
- Peak tick months are May through August. Lone star adults peak first, then nymphs, then August larval swarms.
- Deer tick adults are active from late fall through winter in the Southeast.
- Fleas often rebound in fall. Don't stop prevention in September.
- Lone star ticks were 98% of ticks collected in South Carolina's survey, and ehrlichiosis was NC's most reported tick disease in 2024.
- Check the same day. Spotted fever can pass in under 4 hours, while Lyme generally takes more than 24.
- Treat shade, not the whole yard, and give indoor flea treatment several weeks to work.
Sources: T. Lephoto, H. Mwambi, O. Bodhlyera and H. Gaff, "Bayesian Multivariate Modelling of Lone Star Tick Life Stage Abundance … in Virginia", International Journal of Environmental Research and Public Health 23:660 (2026); K. C. Dye-Braumuller et al., "Filling the Gap: Establishing a Statewide Tick and Tick-Borne Pathogen Surveillance Program", Insects 17:414 (2026); L. Eisen, "Seasonal activity patterns of Ixodes scapularis and Ixodes pacificus in the United States", Ticks and Tick-borne Diseases (2025); NC Department of Health and Human Services, "North Carolina Tickborne Disease Annual Report 2024"; CDC, "Geographic Distribution of Suspected Alpha-gal Syndrome Cases", MMWR 72(30), 2023; CDC, "Lyme Disease Transmission"; CDC, "Preventing Tick Bites"; M. L. Levin et al., minimal attachment time for R. rickettsii transmission by Dermacentor variabilis, Journal of Medical Entomology, via Entomology Today; S. W. Self et al., "A nowcast model to predict outdoor flea activity in real time for the contiguous United States", Parasites & Vectors (2024); D. C. Zentko and D. L. Richman, "Cat Flea", UF/IFAS EENY-011; M. F. Potter, "Flea Control and Prevention", University of Kentucky Entomology; Companion Animal Parasite Council, "General Guidelines for Dogs and Cats" and "The Case for Year-Round Flea and Tick Control"; Clemson Livestock Poultry Health, "South Carolina Ticks and Animal Health"; H. Gaff, "5 Facts about Lone Star Ticks", YouTube; owner accounts from Reddit (via Google search excerpts).
Frequently Asked Questions
Ticks become active from March and peak from late spring through summer. In South Carolina's statewide survey, collections peaked in late March and again in early to mid June. Fleas build through the warm months and often rebound in fall. Because something is active in every month, vets recommend year-round prevention.
Yes. In the Southeast, adult blacklegged (deer) ticks are active from fall through winter, peaking roughly from November or December to March. Lone star ticks are much less active in winter, but they don't disappear from the area.
May through July for most people. Lone star tick adults peak in May and June and nymphs in June and July, according to a southeastern Virginia study. Swarms of tiny larvae, called seed ticks, follow in August.
The lone star tick. It made up 98.1% of 3,674 ticks collected in a 2020 statewide survey of South Carolina state parks, with the highest densities on the southern coast.
Southern summer heat and dry spells can cut how long fleas survive outside shaded spots. As temperatures ease, conditions improve, and a 2024 national flea activity model shows a fall rebound from early October to late November across much of the eastern US. That's why stopping prevention in September often backfires.
Yes. The Companion Animal Parasite Council recommends year-round, lifelong prevention. In the Southeast, deer tick adults are active in winter, and indoor flea infestations continue in a heated home.
It depends on the disease. The CDC says Lyme bacteria generally need more than 24 hours of attachment, but a CDC study found the bacteria behind Rocky Mountain spotted fever can pass in less than 4 hours. Check for ticks the same day you've been outdoors.
Flea pupae sit in cocoons that insecticides can't get through, usually for 1 to 4 weeks, sometimes longer. New adults keep appearing after treatment. Keep vacuuming daily, use an insect growth regulator, keep every pet on prevention, and give it several weeks.
No. Flea larvae develop mainly in shaded, protected, humid spots. The University of Florida calls spraying the entire yard wasteful and irresponsible. Treat the shady areas where pets rest, under decks, and along the foundation and crawl space entries.
Yes. The CDC found the highest rates of suspected alpha-gal syndrome cases in a region that includes North Carolina and Virginia. In the US the condition is mainly linked to lone star tick bites.
Photo credits: NIAID, CC BY 2.0; Andrei Savitsky, CC BY 4.0; Auguste Le Roux, CC BY 3.0; all via Wikimedia Commons.