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Sun Valley ski resort
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Tier C — ENSO-proof

North America

Sun Valley Snow Forecast

Closed for the season

Best months to book: February, March, January · last season + 30-yr record

Closed for the season — closed April 12

Weather data is still collected for informational purposes.

Last Snowfall

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Past 24 Hours

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Past 10 Days

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7-Day Forecast

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Snow Depth

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Updated: Sep 20, 11:03 PM•Weather at base: 1,753m
SnowSure™ Score2025-26 season
Closed for the season

Sun Valley is closed for the season. Here is when it is usually best to book.

Best months to book: February, March, January. Best weeks: 1 Mar–7 Mar, 22 Feb–28 Feb, 8 Mar–14 Mar.NovDec3Jan1Feb2MarAprOpens 28 NovCloses 12 Apr

February

#1 to book

40cm avg · scored 30.3

March

#2 to book

41cm avg · scored 20.8

January

#3 to book

39cm avg

Best weeks to book

  1. #11 Mar – 7 Marscored 29
  2. #222 Feb – 28 Febscored 30.3
  3. #38 Mar – 14 Marscored 23.2

Ranked on 25% last season's SnowSure score (2025-26) · 75% 30-year snowfall and base-depth record. The live score returns when the lifts turn.

Snow Summary

2,789m
ECMWFGFSGEMJMAICONMétéo-Fr

Updated Sep 20, 2026 at 11:03 PM

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Past 10d
7-Day Forecast
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Now20
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S26
Days 8–14 and every model are in Pro.Unlock with Pro
Past
Today
Forecast

Hourly Forecast

20 Sun
11° / -2°
21 Mon
12° / -0°
22 Tue
13° / 1°
23 Wed
13° / 1°
24 Thu
16° / 1°
25 Fri
15° / 2°
26 Sat
9° / 2°
Days 8–14 and every model are in SnowSure Pro.Unlock with Pro
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight27 Sun28 Mon29 Tue30 Wed1 Thu2 Fri3 Sat
Conditions☀️☀️☀️☀️🌧️☀️☁️☁️🌤️☀️☀️☀️☀️☀️☀️☀️☀️🌧️⛅☁️☁️
clearclearclearclearlight drizzleclearcloudycloudymostly clearclearclearclearclearclearclearclearclearlight drizzlesome cloudscloudycloudy
Summit2,789 mModeled
Temp°C3°11°2°4°12°3°6°12°3°5°13°4°6°15°5°7°14°6°5°9°4°
Feels like°C0°9°-1°2°9°1°3°8°1°2°10°2°3°12°2°4°9°3°1°4°1°
Snowcm·····················
Precipmm····0.50.1·0.40.2········0.5··0.1
Windkm/h4534844933104412461869145
Mid-mountain2,271 mModeled
Temp°C6°14°5°8°15°7°9°15°7°8°16°8°10°18°8°11°17°9°8°12°8°
Feels like°C4°13°3°6°13°5°7°12°5°6°13°5°7°15°6°8°13°6°4°8°5°
Snowcm·····················
Precipmm····0.50.1·0.40.2········0.5··0.1
Windkm/h4534844933104412461869145
Base1,753 mModeled
Temp°C10°18°9°11°19°10°12°18°10°12°19°11°13°22°12°14°21°13°11°16°11°
Feels like°C8°17°7°10°17°9°11°16°9°10°17°9°11°19°10°11°17°10°8°12°9°
Snowcm·····················
Precipmm····0.50.1·0.40.2········0.5··0.1
Windkm/h4534844933104412461869145
Humidity%764883775180664984713974582964503159543552
0°C linem—————————————————————
Forecast Range · SnowSure Pro

Every model for Sun Valley, side by side for 14 days

Where the models agree, where they split, and which one has been most accurate here. Free for 14 days, then yearly.

Unlock with Pro

SnowSure™ blend — verified model weighting

The black line is not a simple average. For Sun Valley (rockies), we combine seven global weather models using weights learned from daily forecast verification — comparing each model's prediction to measured snowfall (SNOTEL, resort reports, ERA5).

  • 1.Horizon buckets: days 1–3, 4–7, and 8–14 each get separate weights — short-range skill differs from long-range.
  • 2.Regional calibration: weights come from verified error in this geography (Rockies, Alps, Japan, etc.), recalculated weekly.
  • 3.Ground truth only: we never grade a forecast against another model — only against measured snow.

Building verification history for this resort.

How we verify forecasts →

Snowfall Forecast Maps

Pacific Northwest & BC region

El Niño Outlook · Winter 2026-27

Sun Valley El Niño rank & forecast

Sun Valley ranks #212 of 488 SnowSure resorts — Tier C, 0% in strong El Niño winters.

Tier C — ENSO-proof: Strong El Niño winters looked like a normal year here — within about ±3% of this resort’s own 30-year snowfall average. Not a jackpot, not a bust: a hedge if you’re planning around El Niño.

#212 of 488Tier C — ENSO-proof

Strong-event signal: 0% vs this resort's 30-yr avg

In the three strongest El Niño winters on record ('97-98, '15-16, '23-24), Sun Valley averaged +0% versus its own 30-year snowfall baseline — effectively ENSO-proof. Sun Valley has held within a few percent of normal across every phase of the Pacific cycle, making it one of the safest bets of a record El Niño winter 2026-27. Analog winters: '97-98 -0%, '15-16 -3%, '23-24 +4%.

'97-98 0%'15-16 −3%'23-24 +4%

Signal = average snowfall in the three strongest El Niño winters since 1996 ('97-98, '15-16, '23-24) vs this resort's own 30-year ERA5 baseline. n=3 — a lean, not a law. Updated monthly against measured snowfall Dec–Mar.

Full El Niño report →

ENSO seasonal analog

History · not a forecast

In 10 past El Niño winters at Sun Valley, ERA5 season snowfall median was 244 cm (96 in), about 5% below this resort’s long-term median. This is a historical analog from reanalysis — not a prediction of this winter’s storm track.

Prevailing ONI

El Niño

JJA 2026 · ANOM +1.8°C

Analog season median

244cm

10 El Niño winters · 5% below median

All-season median

257cm

Across 30 ERA5 seasons (2026-27)

PhaseSeasonsMedianp25–p75Recent analogs
El Niñocurrent10244cm230cm – 269cm2023, 2019, 2018, 2015, 2014, 2009
La Niña12277cm235cm – 338cm2022, 2021, 2020, 2017, 2011, 2010
ENSO-neutral8247cm214cm – 324cm2025, 2024, 2016, 2013, 2012, 2003

Season snowfall from Open-Meteo ERA5 reanalysis (~9 km). ENSO phase from NOAA CPC Oceanic Niño Index. Relative phase differences are more trustworthy than absolute cm totals. Source: NOAA CPC Oceanic Niño Index + Open-Meteo ERA5 via SnowSure season archive.

Local Reports

0 reports

How accurate is this forecast?

We verify every forecast against what actually fell — see the model-by-model results.

→

Frequently asked questions about Sun Valley

How much snow is Sun Valley getting this week?
No significant snow is forecast at Sun Valley over the next 7 days.
What is the 14-day snow forecast for Sun Valley?
The full 14-day forecast for Sun Valley — the SnowSure™ blend and every model we track, day by day — is part of SnowSure Pro. The first 7 days are free on this page.
How accurate are SnowSure forecasts for Sun Valley?
We verify every forecast against what actually fell and publish the results — see our forecast verification pages for model-by-model accuracy, updated continuously.