Pool season · North Dakota
Fargo Pool Season: the Year on One Bar
Last updated: July 25, 2026 · dates · water temp
One bar, one year, one Fargo pool. The season bar below draws everything the model knows — opening window, prime season, closing window — against today's date, with the working details one click away on the opening and closing pages.
Fargo, ND — 48 swim days a yearReading it takes ten seconds: 52 dots, one per week. Solid teal is Fargo's swim season; the hollow teal run before it (May 6 to May 27) is when to open; the hollow amber run after is when to close, with September 21 as the deadline; gray is the covered season. Today's marker shows where you stand in that cycle right now.
The Fargo pool calendar
Opening — target May 13
Open by May 13 — a two-week head start on the May 27 crossing keeps startup chemistry small and beats the local service rush.
Closing — deadline September 21
Hold the cover until September 11, then winterize by September 21, a week ahead of the October 2 freeze normal. Late and cold beats early and warm.
Estimated water temperature by month
Monthly averages of the site's water model run on Fargo's own normals — the shape of a typical year, not a forecast. The widget above shows where the current year actually sits.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 10° | 9° | 19° | 35° | 49° | 63° | 69° | 71° | 64° | 53° | 36° | 22° |
The curve peaks near 71°F — comfortable-water months here usually involve a heater or a solar cover.
Every station tells its own story: compare this curve with Bismarck's pool season or jump back to the North Dakota season index to see the statewide spread.
Fargo pool season FAQ
When should I open my pool in Fargo, ND?
Open by May 13 — the model places Fargo's 61°F crossing about two weeks later, and every warm day you wait pushes the water toward the 65°F algae zone. The Fargo opening guide has the 12-step sequence.
When should I close my pool in Fargo?
Close by September 21: cool water keeps its winter chemistry, but freeze damage is the hard stop. The Fargo closing guide sequences the work backward from that date.
How long is the swim season in Fargo?
Fargo averages 48 days a year with normal highs of 80°F or better — about 8 days earlier than the North Dakota median. The North Dakota season index ranks all 2 covered cities by the same metric.
How warm does pool water get in Fargo?
An unheated pool near Fargo typically peaks around 71°F in high summer and bottoms out near 8°F in winter, never quite reaching the 78°F comfort line without a heater or solar cover. The month-by-month curve above shows the whole cycle; the methodology page explains the ±5°F error bars.
Email me when Fargo hits the closing window
Data: NOAA 1991–2020 climate normals via Fargo 3s (2.9 mi); live outlook by Open-Meteo. Attribution: sources · assumptions: methodology.