Teton County declared a local emergency on Monday, July 13, after three linked measles cases established Wyoming’s first outbreak of 2026 in Colter Bay Village. The action matters to Grand Teton National Park visitors because health officials identified public exposure windows inside the park and at busy locations in Jackson and Teton Village.
The county emergency notice says the outbreak exceeds normal day to day response capacity in a community serving large numbers of summer travelers. The declaration does not close Grand Teton or Colter Bay, but visitors who were at the named places during the listed times should follow the official monitoring guidance rather than treating the alert as a general park shutdown.
- What changed: Teton County declared a local emergency July 13 after confirming three linked Colter Bay cases.
- Park exposure sites: Notices name Colter Bay restaurants, a convenience store, a cabin office, a general store, and the launderette and showers.
- Other locations: Exposure windows also include businesses in Jackson and the July 4 fireworks area at Teton Village.
- What remains open: Officials did not announce a park closure or a blanket restriction on Colter Bay visits.
- Official action: People at a listed site and time should monitor for symptoms for 21 days after possible exposure and call a health care provider before arriving if symptoms develop.
Why Teton County declared an emergency
The county says three related cases were confirmed among people living in Colter Bay Village on June 28, July 10, and July 11. That linked transmission meets the outbreak threshold, while the local declaration gives the response a formal emergency structure because routine operations are no longer considered sufficient.
Colter Bay is a particularly difficult setting for containment because concession workers live close together and the village receives visitors from across the United States and abroad. The county highlighted infants, pregnant people, and people with weakened immune systems as groups at higher risk if exposed.
The emergency notice recommends that people confirm their immunity status or seek the measles, mumps, and rubella vaccine if they cannot confirm protection. That is population level guidance from local health officials, while any personal decision about vaccination, symptoms, pregnancy, immune status, or treatment belongs with a qualified health care provider.
Wyoming Public Media independently reported that the first patient lived and worked inside Grand Teton National Park and was recovering in isolation after a hospital discharge. Its account confirms the first Colter Bay exposure windows and adds context to the official timeline without replacing the current location list.
Grand Teton exposure windows named by officials
The earliest listed park locations were Cafe Court Pizzeria and Ranch House Restaurant in Colter Bay Village from noon to 10 at night on June 17 and June 18. The Colter Bay Convenience Store was also listed for June 20 from 2 to 4 in the afternoon, followed by a Jackson Target exposure window on June 25 from 7 to 9:30 in the morning.
A later National Park Service notice added the Colter Bay General and Grocery Store, Coffee Bar, and Gift Shop on July 7 from 9 to 11 in the morning. It also named the Colter Bay Cabin Office on July 7 from 3 in the afternoon through midnight, plus two Jackson businesses on July 5.
The July 13 case notice added the Colter Bay Launderette and Showers for July 5 and July 6 from 6:45 in the morning to 5:15 in the afternoon, and July 7 from 1:30 to 10:30 at night. Outside the park, it listed Annie’s Thai Kitchen in Jackson on July 4 from 5 to 8 in the evening and the base of Jackson Hole Mountain Resort during the July 4 fireworks event from 6:30 to 11 at night.
Travelers should compare those exact places, dates, and times with their own movements rather than assuming that any visit to Grand Teton created the same exposure. The notices identify specific windows, and officials have not advised all park visitors to cancel future trips or leave the area.
What potentially exposed visitors should do
The National Park Service says people present at a listed location during an exposure window should monitor themselves for symptoms for 21 days after that date. Symptoms commonly include fever, cough, a runny nose, red eyes, and a rash, and they may develop seven to 21 days after exposure.
Anyone who develops possible symptoms should call a health care provider before arriving for care so the office can take precautions that reduce exposure to other patients. Travelers should use the Wyoming Department of Health measles page for the latest exposure list and public health instructions.
People who were not at a named site and time do not have the same notice directed at them, although the outbreak remains active. Checking the official list before a travel day is more reliable than relying on a saved screenshot because exposure locations and public instructions can change as contact tracing continues.
Visitors who are continuing with a park trip can keep ordinary planning separate from the health alert. Deep Arrival’s Grand Teton and Yellowstone itinerary can help with route sequencing, while Teton County, the Wyoming Department of Health, and the National Park Service remain the authorities for current outbreak information.
What the declaration does not mean
A local emergency declaration is not the same as a closure order. The county’s notice describes extra response needs and an active outbreak, but it does not close Grand Teton National Park, Colter Bay Village, park roads, lodging, restaurants, trails, or visitor services.
The declaration also does not establish that every person at Colter Bay was exposed or infected. The useful traveler decision is narrower: review the official windows, monitor for the stated period if there is a match, and call ahead before seeking care if compatible symptoms appear.
Future conditions could change if officials identify additional linked cases, new exposure locations, service restrictions, or different public instructions. As of July 13, the response is centered on case investigation, exposure notification, confirming immunity, vaccination, and symptom monitoring rather than restricting general travel.
| Your situation | What the notice says | Best next step |
|---|---|---|
| You were at a listed place during its exposure window | Possible public exposure identified | Monitor for symptoms for 21 days after that date and follow Wyoming health guidance |
| You develop possible symptoms | Prevent additional exposure in a waiting room | Call a health care provider before arriving for care |
| You visited Grand Teton outside the listed places and times | No blanket exposure notice applies to every park visitor | Check the current official list and continue monitoring updates |
| You have an upcoming Colter Bay trip | No park or village closure was announced | Keep the trip under review and verify current county and NPS notices |
| You cannot confirm immunity | County officials recommend confirming status or obtaining MMR protection | Ask a qualified health care provider about the appropriate action for you |
- Do not treat this as a park closure: Grand Teton remains open under the current notices.
- Match the details: Exposure guidance is tied to exact locations, dates, and times.
- Use live official information: Teton County and Wyoming health pages can add locations as the response develops.
- Call before seeking care: Advance notice lets a provider reduce exposure to other patients.
- Separate health and itinerary planning: Park routes can continue while official outbreak instructions control health decisions.
What to watch next
The main changes to watch are new linked cases, added public exposure windows, or an operating restriction at a visitor service. A revised county emergency notice, Wyoming health bulletin, or NPS update would be more meaningful than an undated social post or a general headline about measles activity elsewhere.
Travelers should also note whether officials change the monitoring period or issue new instructions for people with a documented exposure. Until then, the county’s July 13 declaration and the current location list provide the clearest basis for a decision.
Is Grand Teton National Park closed because of measles?
No. Teton County declared a local health emergency, but officials did not announce a closure of Grand Teton National Park or Colter Bay Village.
Where were the Grand Teton exposure sites?
Official notices identify several Colter Bay businesses and services, including restaurants, a convenience store, the general store complex, a cabin office, and the launderette and showers, each with specific dates and times.
What should a visitor do after a listed exposure?
The National Park Service says to monitor for symptoms for 21 days after the potential exposure and call a health care provider before arriving if symptoms develop.
Does every Grand Teton visitor need to cancel?
No blanket cancellation advice has been issued. Travelers should compare their visit with the official exposure windows and keep checking current Teton County and Wyoming health information.
Why did Teton County declare an emergency?
The county says three linked Colter Bay cases created Wyoming’s first measles outbreak of 2026 and that the response exceeds normal day to day operating capacity.
