Historical hail archive: January 2016–December 2025. NOAA radar estimates within 25 miles of each city centre. ZIP matches use the first three digits; this is not a property-level report or a live alert service. Coverage and source.
Larimer County · Colorado · NOAA radar record 2016–2025
Hail damage in Fort Collins, CO
Radar has detected hail over Fort Collins on 294 separate days since 2016. On 98 of them the largest stone was estimated at golf-ball size or bigger. The biggest was 10.2 cm on June 17, 2025.
A high value in this historical exposure model. Radar estimates do not establish what reached a property or whether it was damaged.
How we got to that number
| Component | Value | Weight | Contribution |
|---|---|---|---|
| Frequency Hail days per year at 1.00 in (2.5 cm) or larger | 53 / 100 | × 0.35 | 18.7 |
| Severity Largest stone radar estimated in the whole window | 100 / 100 | × 0.30 | 30.0 |
| Recency How long since the last 2 in (5 cm) day | 91 / 100 | × 0.20 | 18.2 |
| Concentration Hail days per year reaching golf-ball size | 49 / 100 | × 0.15 | 7.4 |
| RoofTake Score | 74 | ||
The score describes an area, not a house. Two roofs on the same street of different ages face very different risk from the identical storm. The whole formula and its weights are on the methodology page, and you can recompute it yourself from our public data.
Northern Front Range storms often track directly over the city in late afternoon.
Check your own ZIP code Is your roof damaged?
Data last refreshed: · source: NOAA NCEI Severe Weather Data Inventory, dataset nx3hail
The ten biggest hail days in Fort Collins since 2016
| Date | Radar max size | Metric | Comparison | Signatures |
|---|---|---|---|---|
| June 19, 2018 | 4.00 in | 10.2 cm | Grapefruit | 154 |
| August 20, 2019 | 4.00 in | 10.2 cm | Grapefruit | 28 |
| July 28, 2022 | 4.00 in | 10.2 cm | Grapefruit | 112 |
| August 1, 2023 | 4.00 in | 10.2 cm | Grapefruit | 119 |
| June 17, 2025 | 4.00 in | 10.2 cm | Grapefruit | 271 |
| June 17, 2019 | 3.75 in | 9.5 cm | Teacup | 24 |
| July 5, 2019 | 3.75 in | 9.5 cm | Teacup | 23 |
| September 1, 2019 | 3.75 in | 9.5 cm | Teacup | 7 |
| July 27, 2022 | 3.75 in | 9.5 cm | Teacup | 14 |
| July 27, 2016 | 3.50 in | 8.9 cm | Teacup | 26 |
"Signatures" is the number of separate radar volume scans that detected hail in a storm cell within 25 miles that day. More signatures means a longer-lived or larger storm, not necessarily bigger stones.
Hail days by year
Busiest year in the record: 2023 with 42 hail days.
Hail days by month
Peak month: July. Hail season in Colorado is short and it is not distributed evenly — most of the annual risk arrives in a few weeks.
What to do with this if you own a roof in Fort Collins
- Find your dates. Look up your ZIP for the record nearest you, and note every day at 1.00 in or above since you bought the house.
- Work out whether your roof could have survived them. A twelve-year-old asphalt roof and a two-year-old one respond very differently to the same stone — the age calculator explains why.
- Look, before you file. Nine photographs, none of them requiring you to get on the roof.
- Check the arithmetic. If the actual cash value of the damage is under your deductible, filing pays nothing — work it out first.
- Then write. The letter generator puts the Fort Collins radar record and the NOAA citation into your notice of claim.
Every hail day radar recorded near Fort Collins
294 days, most recent first. Sizes are radar estimates of the largest stone aloft in the cell, not measurements at any address.
- October 4, 20251.25 in (3.2 cm) — Half dollar size, radar-estimated
- September 16, 20251.25 in (3.2 cm) — Half dollar size, radar-estimated
- August 30, 20250.75 in (1.9 cm) — Penny size, radar-estimated
- August 27, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- August 11, 20251.75 in (4.4 cm) — Golf ball size, radar-estimated
- August 10, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- July 31, 20253.00 in (7.6 cm) — Teacup size, radar-estimated
- July 26, 20251.75 in (4.4 cm) — Golf ball size, radar-estimated
- July 24, 20252.50 in (6.3 cm) — Tennis ball size, radar-estimated
- July 23, 20252.00 in (5.1 cm) — Hen egg size, radar-estimated
- July 18, 20250.75 in (1.9 cm) — Penny size, radar-estimated
- July 17, 20251.75 in (4.4 cm) — Golf ball size, radar-estimated
- July 16, 20251.25 in (3.2 cm) — Half dollar size, radar-estimated
- July 14, 20250.50 in (1.3 cm) — Marble size, radar-estimated
- July 12, 20252.50 in (6.3 cm) — Tennis ball size, radar-estimated
- July 11, 20252.00 in (5.1 cm) — Hen egg size, radar-estimated
- July 10, 20251.75 in (4.4 cm) — Golf ball size, radar-estimated
- July 8, 20250.75 in (1.9 cm) — Penny size, radar-estimated
- July 5, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- July 4, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- June 29, 20253.25 in (8.3 cm) — Teacup size, radar-estimated
- June 26, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- June 25, 20253.00 in (7.6 cm) — Teacup size, radar-estimated
- June 17, 20254.00 in (10.2 cm) — Grapefruit size, radar-estimated
- June 16, 20252.25 in (5.7 cm) — Hen egg size, radar-estimated
- June 14, 20250.50 in (1.3 cm) — Marble size, radar-estimated
- June 13, 20250.50 in (1.3 cm) — Marble size, radar-estimated
- June 12, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- June 11, 20251.00 in (2.5 cm) — Quarter size, radar-estimated
- June 1, 20251.25 in (3.2 cm) — Half dollar size, radar-estimated
- May 31, 20250.75 in (1.9 cm) — Penny size, radar-estimated
- May 30, 20251.50 in (3.8 cm) — Ping-pong ball size, radar-estimated
- May 27, 20251.75 in (4.4 cm) — Golf ball size, radar-estimated
- May 26, 20251.50 in (3.8 cm) — Ping-pong ball size, radar-estimated
- May 18, 20252.00 in (5.1 cm) — Hen egg size, radar-estimated
- May 4, 20250.75 in (1.9 cm) — Penny size, radar-estimated
- April 24, 20251.50 in (3.8 cm) — Ping-pong ball size, radar-estimated
- September 8, 20241.25 in (3.2 cm) — Half dollar size, radar-estimated
- August 16, 20240.75 in (1.9 cm) — Penny size, radar-estimated
- August 13, 20241.50 in (3.8 cm) — Ping-pong ball size, radar-estimated
- August 10, 20241.50 in (3.8 cm) — Ping-pong ball size, radar-estimated
- August 7, 20243.00 in (7.6 cm) — Teacup size, radar-estimated
- July 28, 20241.25 in (3.2 cm) — Half dollar size, radar-estimated
- July 27, 20241.50 in (3.8 cm) — Ping-pong ball size, radar-estimated
- July 21, 20243.00 in (7.6 cm) — Teacup size, radar-estimated
- July 20, 20240.50 in (1.3 cm) — Marble size, radar-estimated
- July 19, 20240.50 in (1.3 cm) — Marble size, radar-estimated
- July 14, 20240.50 in (1.3 cm) — Marble size, radar-estimated
- June 20, 20241.75 in (4.4 cm) — Golf ball size, radar-estimated
- June 15, 20241.00 in (2.5 cm) — Quarter size, radar-estimated
- June 14, 20241.50 in (3.8 cm) — Ping-pong ball size, radar-estimated
- June 11, 20241.00 in (2.5 cm) — Quarter size, radar-estimated
- June 10, 20241.50 in (3.8 cm) — Ping-pong ball size, radar-estimated
- June 8, 20241.25 in (3.2 cm) — Half dollar size, radar-estimated
- May 30, 20240.50 in (1.3 cm) — Marble size, radar-estimated
- May 29, 20242.50 in (6.3 cm) — Tennis ball size, radar-estimated
- May 25, 20241.00 in (2.5 cm) — Quarter size, radar-estimated
- May 22, 20240.75 in (1.9 cm) — Penny size, radar-estimated
- May 21, 20240.75 in (1.9 cm) — Penny size, radar-estimated
- May 13, 20240.50 in (1.3 cm) — Marble size, radar-estimated
Showing the 60 most recent of 294. The full record is in the JSON we publish: fort-collins-co.json.
From people in Fort Collins
The part of this page that no dataset can produce. Everything here is read by a human before it appears.
Neighbourhood reports
Claim outcomes
Damage photos from Fort Collins storms
Hail in Fort Collins, CO: common questions
How often does Fort Collins get damaging hail?
Radar recorded 294 hail days within 25 miles of the city centre between 2016 and 2025 — an average of 29.4 a year, of which 9.8 a year were at golf-ball size or larger. Not every one of those damages roofs.
When is hail season in Fort Collins?
The busiest month in this record is July, and 2023 was the busiest single year with 42 hail days.
Does this mean my roof is damaged?
No. These are radar estimates of the largest stone aloft in a storm cell somewhere within 25 miles of the city centre. Whether anything landed on your street, and whether it damaged your particular roof, needs somebody to look.
How do I use this for an insurance claim?
A specific date with a public, citable source is what turns 'sometime last year' into a date of loss. Use the claim letter generator, which pulls the date and the NOAA citation in for you.
Why 25 miles?
It is wide enough to catch storms that clipped the metro and narrow enough that the number still means something for a house inside it. The same radius is used for every metro so the pages are comparable.
Get quotes from roofers who work in Fort Collins
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