Idaho landlord guide — St. Anthony (county seat, Henry’s Fork), Island Park (longest main street in U.S.), Ashton (Yellowstone gateway), Mesa Falls Scenic Byway & Idaho Code §§ 6-301 et seq.
🏛️ County Seat: St. Anthony (~4,093) 👥 Population: ~14,554 (2025 est.) 🌿 Economy: Potatoes, dairy, Yellowstone tourism
Fremont County occupies the northeastern corner of Idaho, where the Upper Snake River Plain transitions dramatically into the volcanic plateaus and mountain ranges of the Greater Yellowstone region. Named for explorer John C. Frémont and established in 1893, the county borders Montana to the north and Wyoming to the east, and a small portion of Yellowstone National Park — America’s first — extends into its northeastern reaches. The county has a geographically distinctive character: its southern portion is agricultural Snake River Plain, while the north rises through forested volcanic uplands toward the Yellowstone caldera country, and the entire northern region is dominated by tourism, outdoor recreation, and spectacular natural scenery. Fremont County is one of the few U.S. counties that borders two counties of the same name in different states — it abuts both Madison County, Idaho and Madison County, Montana, and both Teton County, Idaho and Teton County, Wyoming.
St. Anthony, the county seat on the Henry’s Fork of the Snake River, serves as the agricultural service hub of the county with about 4,093 residents. Ashton, to the north, is the gateway to Mesa Falls and the Yellowstone corridor. Island Park — a long, narrow municipality incorporated in 1947 specifically to circumvent Idaho’s prohibition on liquor sales in unincorporated areas — stretches 33 miles along U.S. Highway 20 and holds the distinction of having the longest “main street” in the United States. The county’s economy blends agriculture (potatoes, dairy, hay) with a significant and growing tourism and recreation economy centered on the Henry’s Fork fly fishery (one of the world’s most famous), the St. Anthony Sand Dunes OHV area, the Mesa Falls Scenic Byway, and proximity to Yellowstone National Park approximately 70 miles north of St. Anthony.
All landlord-tenant matters in Fremont County are governed by Idaho Code §§ 6-301 et seq. (evictions), §§ 6-320 and 6-321 (security deposits), and §§ 55-208 and 55-307 (tenancy and notice). Eviction actions are filed as Unlawful Detainer proceedings at the Fremont County District Court (Seventh Judicial District), 151 W. 1st North Street, Room 12, Saint Anthony, ID 83445, (208) 624-7332. Idaho prohibits rent control statewide.
St. Anthony (~4,093), Island Park (~33-mile “main street,” Yellowstone area), Ashton (~949; Yellowstone gateway, Mesa Falls), Newdale (~337), Teton (~470), Warm River (pop. 1)
Median HH Income
~$72,767 (county); St. Anthony city: ~$52,446 (poverty ~21%)
Principal Economy
Agriculture (potatoes, dairy, hay, grain); tourism & recreation (Yellowstone NP ~70 miles, Henry’s Fork fly fishing, Island Park, St. Anthony Sand Dunes OHV, Mesa Falls Scenic Byway); LDS community services; county & school government; Targhee NF
Key Landmarks
Henry’s Fork of Snake River (world-class fly fishing); Island Park Reservoir; Mesa Falls (Upper and Lower, among Idaho’s highest waterfalls); St. Anthony Sand Dunes; Teton Dam historic site (1976 failure); Yellowstone NP (corner of county)
Island Park Note
Incorporated 1947 to allow liquor sales along Hwy 20; holds record for longest “main street” in U.S. at 33 miles; major summer/winter recreation hub
5/10 — Stable agricultural base; growing Yellowstone tourism economy; Island Park seasonal demand; moderate income; no local ordinances; dual market (ag + recreation)
⚖️ Eviction At-a-Glance
Nonpayment Notice
3-Day Notice to Pay or Vacate
Lease Violation
3-Day Notice to Perform or Quit
No-Cause (Month-to-Month)
30-Day Written Notice
Court
Fremont County District Court — Magistrate Division (7th Judicial District)
Courthouse Address
151 W. 1st North St, Rm 12, Saint Anthony, ID 83445
Court Phone
Main: (208) 624-7332 — General: (208) 624-7401
Court Hours
Mon–Fri 8:00 a.m.–5:00 p.m.
Process Name
Unlawful Detainer
Post-Judgment
Writ of Possession; tenant has 72 hrs to vacate
Security Deposit
No cap; return within 21 days; 3× penalty for wrongful withholding
Avg Timeline
3–5 weeks typical
Fremont County Local Ordinances & Landlord Rules
Idaho state law governs landlord-tenant matters — no supplemental local ordinances in Fremont County
Category
Details
No Local Ordinances
Neither Fremont County nor any of its incorporated cities — St. Anthony, Ashton, Island Park, Newdale, Teton, or Warm River — has enacted local landlord-tenant ordinances supplementing Idaho state law. No rental registration, no source-of-income protections, no supplemental notice requirements. Idaho Code §§ 6-301 et seq. applies exclusively throughout the county.
Rent Control
Idaho Code § 55-304 prohibits rent control statewide. No jurisdiction in Fremont County may enact rent stabilization. Month-to-month rent increases require 30 days’ prior written notice before the rent due date.
Security Deposit
No statutory cap under Idaho law. Idaho Code § 6-321 requires return of the deposit or itemized written deductions within 21 days of tenancy end (up to 30 if lease specifies). Failure to comply forfeits the right to withhold and exposes the landlord to 3× damages plus attorney fees. Move-in and move-out condition documentation is essential at all rent levels.
The Two-Market Dynamic: Agriculture vs. Recreation
Fremont County’s rental market operates across two fundamentally different economic contexts. In St. Anthony and the agricultural south of the county, the market is dominated by farming families, agricultural workers, and service sector employees whose incomes are tied to the Snake River Plain’s potato and dairy economy. In Island Park, Ashton, and the northern recreation corridor, the market is increasingly driven by tourism and recreation — seasonal staff at lodges, outfitters, snowmobile rental companies, fishing guide services, and Yellowstone-area hospitality businesses. These two markets have different seasonality patterns, income profiles, and lease structure needs. Landlords in the northern corridor should use fixed-term seasonal leases; landlords in St. Anthony and the agricultural valley should plan for year-round tenancies with agricultural income patterns.
Island Park Seasonal Character
Island Park operates on two strong seasons: summer (June–September, driven by Yellowstone-area tourism, fly fishing on the Henry’s Fork, and general recreation) and winter (December–March, driven by snowmobiling on Idaho’s extensive Island Park snowmobile trail network — one of the premier snowmobile destinations in the U.S.). The community has extremely limited year-round permanent population, but its seasonal workforce creates genuine short-term housing demand from hospitality and recreation employees. Fixed-term leases tied to each season are the standard structure for Island Park employment housing.
Income Screening in St. Anthony
St. Anthony’s city-level poverty rate of approximately 21% makes income verification especially important for landlords operating in the county seat. Even at moderate rent levels, a significant portion of the local population faces financial stress. Applying the 3x income-to-rent standard consistently, requesting recent pay stubs and employment letters, and running Idaho court records for prior eviction history are the minimum screening standards for any Fremont County rental property.
Idaho Code §§ 6-301 et seq. — statutes, notice requirements, and landlord rights that apply in Fremont County
⚡ Quick Overview
3
Days Notice (Nonpayment)
3
Days Notice (Violation)
15-30
Avg Total Days
$166
Filing Fee (Approx)
💰 Nonpayment of Rent
Notice Type3-Day Notice to Pay or Quit
Notice Period3 days
Tenant Can Cure?Yes
Days to Hearing5-12 days
Days to Writ3-5 days
Total Estimated Timeline15-30 days
Total Estimated Cost$200-$500
⚠️ Watch Out
Idaho is very landlord-friendly with fast timelines. 3-day notice is one of the shortest in the nation. No state-mandated cure period beyond the notice.
Serve the required notice based on the eviction reason (nonpayment or lease violation).
Wait for the notice period to expire. If tenant cures the issue (where allowed), the process stops.
File an eviction case with the Magistrate Court. Pay the filing fee (~$166).
Tenant is served with a summons and has the opportunity to respond.
Attend the court hearing and present your case.
If you prevail, obtain a writ of possession from the court.
Law enforcement executes the writ and removes the tenant if necessary.
⚠️ Disclaimer: This page provides general information about Idaho eviction laws and does not constitute legal advice.
Eviction procedures can vary by county and may change over time. Local jurisdictions may have additional requirements or tenant protections.
For specific legal guidance, consult a qualified Idaho attorney or local legal aid organization.
🔍 Reduce Your Risk Before Signing a Lease:
Idaho landlords who screen tenants carefully before signing a lease significantly
reduce their risk of ending up in eviction court. Understanding
tenant screening in Idaho —
including background checks, credit history, income verification, and rental references — is one of the most
cost-effective steps you can take to protect your rental property. Before you ever need Idaho's
eviction process, proper tenant screening can help
you identify red flags early and avoid problem tenancies altogether.
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⚠️ Disclaimer: These calculations are estimates based on state statutes and typical court timelines. Actual results vary by county, court backlog, and case specifics. Always verify current requirements with your local courthouse. This is not legal advice.
Underground Landlord
🏙️ Cities in Fremont County
Snake River Plain and Yellowstone corridor communities
~14,554 residents; growing. St. Anthony (county seat, ~4,093; Henry’s Fork, Sand Dunes; poverty ~21%). Island Park (longest main street in U.S. at 33 mi; Yellowstone area; premier fly fishing & snowmobiling). Ashton (~949; Yellowstone gateway; Mesa Falls). Teton Dam site (1976 failure). Agriculture: potatoes, dairy, hay. Yellowstone NP corner. No local ordinances. 3-day nonpayment notice. No deposit cap; 21-day return. No rent control. 7th JD, 151 W. 1st North Rm 12, Saint Anthony, (208) 624-7332.
Fremont County
Screen Before You Sign
Best profiles in St. Anthony & agricultural south: Fremont County School District staff, county government employees, agricultural operation workers with year-round documented wages, Rexburg metro commuters. For Island Park & Ashton recreation corridor: use fixed-term seasonal leases (summer: Jun–Sep; winter: Dec–Mar); best profiles are USFS Targhee NF employees, NPS seasonal rangers, established outfitter company staff. Given St. Anthony’s ~21% poverty rate, apply 3x income-to-rent standard strictly. Run Idaho court records. Fair housing criteria apply consistently.
Potatoes, Fly Fishing, and the Yellowstone Gateway: Landlording in Fremont County, Idaho
Fremont County is where Idaho’s agricultural heartland begins to give way to the Greater Yellowstone region, and the rental market reflects that transition in real and practical ways. Drive north from St. Anthony on U.S. Highway 20 and watch the landscape change: irrigated potato fields on the Snake River Plain gradually yield to sagebrush benchland, which gives way to lodgepole pine forest, which eventually opens onto the volcanic plateau of Island Park — a high, cold, extraordinary landscape that is one of the premier outdoor recreation destinations in the American West. The county’s two identities — hardworking agricultural south and spectacular recreational north — create two distinct rental markets that coexist within the same county courthouse jurisdiction. Idaho Code §§ 6-301 et seq. governs all residential tenancies throughout.
Island Park: America’s Longest Main Street
Island Park exists because of Idaho law. In 1947, the Idaho Legislature passed a law prohibiting liquor sales in unincorporated areas. Entrepreneurs along U.S. Highway 20 in the Island Park area responded by incorporating the entire corridor as a city — a 33-mile-long strip of highway that became the City of Island Park and holds the record for the longest “main street” in the United States. The legal maneuver worked: Island Park could now sell liquor to the tourists, anglers, and hunters traveling between Idaho Falls and Yellowstone National Park. Today, the quirky origin story is a point of local pride, and Island Park has developed into a genuine recreation community with lodges, restaurants, snowmobile rental operations, fishing guide services, and vacation cabins clustered along the highway corridor. Henry’s Fork of the Snake River, which flows through Island Park, is considered one of the most technical and challenging dry-fly trout streams in the world, attracting accomplished fly anglers from across the country and internationally.
The Teton Dam: A Watershed Moment
On June 5, 1976, at approximately 11:57 a.m., the Teton Dam — a federal earthfill dam on the Teton River in eastern Fremont County, completed only months earlier — catastrophically failed as its reservoir was filling for the first time. The failure sent a wall of water downstream through Sugar City, Rexburg, and other communities, killing 11 people, destroying nearly 800 homes, and causing an estimated $2 billion in damages. The dam was never rebuilt. The failure remains one of the most significant dam disasters in U.S. history and contributed substantially to a national reexamination of dam safety standards. The Teton Dam site is now a popular outdoor recreation area and historical landmark, with the remains of the failed structure visible to visitors. For Fremont County, the flood redrew the community’s relationship with federal water management and shaped a generation of skepticism toward large federal infrastructure projects in the area.
St. Anthony Sand Dunes and Agricultural Identity
South of St. Anthony, the St. Anthony Sand Dunes — a 10,600-acre expanse of active sand dunes managed by the Bureau of Land Management — draw off-road vehicle enthusiasts from across the region, particularly on spring and fall weekends. The dunes generate meaningful local economic activity through ATV rentals, camping, and visitor spending in St. Anthony. Combined with the agricultural economy of the Upper Snake River Valley — potato farming, dairy operations, hay, and grain — St. Anthony functions as a practical service hub for the surrounding rural population. The county’s agricultural economy is stable but not high-income; the city-level poverty rate of approximately 21% reflects the modest wages that characterize much of the county’s agricultural and service workforce.
Filing Evictions in Fremont County
The Fremont County District Court at 151 W. 1st North Street, Room 12, in St. Anthony serves the Seventh Judicial District. Main: (208) 624-7332; General: (208) 624-7401. Hours are Monday through Friday, 8:00 a.m. to 5:00 p.m. Idaho’s 3-day notice period for nonpayment applies throughout the county, whether the property is a year-round unit in St. Anthony or a seasonal cabin in Island Park. For seasonal properties in the recreation corridor, landlords should structure leases carefully with defined term start and end dates, clearly articulated holdover provisions, and condition checklists documented at both the beginning and end of each seasonal tenancy.
Fremont County landlord-tenant matters governed by Idaho Code §§ 6-301 et seq. (evictions), §§ 6-320 and 6-321 (security deposits), and §§ 55-208 and 55-307 (tenancy and notice). Nonpayment: 3-day pay or vacate. Lease violation: 3-day perform or quit. No-cause termination (month-to-month): 30-day written notice. Security deposit: no cap; return within 21 days (up to 30 if lease specifies); 3x penalty for improper handling. No rent control (Idaho Code § 55-304). No local landlord-tenant ordinances. Eviction: Unlawful Detainer at Fremont County District Court (7th Judicial District), 151 W. 1st North St, Rm 12, Saint Anthony, ID 83445; Main (208) 624-7332; General (208) 624-7401; Mon–Fri 8am–5pm. 72-hour post-judgment vacate; Writ of Possession if tenant remains. Consult a licensed Idaho attorney before taking legal action. Last updated: May 2026.
Disclaimer: This page provides general information about landlord-tenant law in Fremont County, Idaho and is not legal advice. Laws change frequently. Always verify current requirements with a licensed Idaho attorney before taking legal action. Last updated: May 2026.
