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Halo Upright Wing PMD: A Simple, Deadly Dry Fly Pattern for Every PMD Hatch
If there's one hatch that separates the casual angler from the dedicated dry fly fisherman, it's the Pale Morning Dun. The PMD is the bread and butter of technical dry fly fishing across North America and much of Europe, and the angler who steps to the water unprepared for it will likely watch fish rise untouched all day long. The Moonlit Halo Upright Wing PMD was built specifically for moments like those — a fast-to-tie, minimal-material pattern that delivers the high-riding, upright wing silhouette that selective trout demand, while incorporating modern synthetic materials that outperform traditional options on the water.
The Art and History of the Upright Wing Dry Fly
To understand why the upright wing dry fly has stood the test of time, you have to go back to the origins of American fly tying. The Catskill-style dry fly, developed in the late 1800s and early 1900s by legendary tiers like Theodore Gordon, Edward Hewitt, and the Darbee family, defined what a dry fly should look like: sparse, elegant, riding high on stiff hackle fibers, with a clearly defined upright wing that mimics the newly emerged mayfly dun perfectly. Gordon adapted British wet fly techniques to imitate the American hatches of the Catskill streams — the Beaverkill and the Willowemoc — creating patterns like the Quill Gordon and the Hendrickson that remain classics to this day.
The core philosophy of the Catskill school was exact imitation of the natural insect's silhouette on the water surface. A freshly emerged mayfly dun holds its wings upright like tiny sails as it drifts helplessly in the current, drying its wings before flight. That unmistakable profile — wing held vertically, body suspended just above the film — is what triggers the instinctive rise of a feeding trout. Catskill tiers used wood duck flank fibers, hen back, and later CDC (Cul de Canard) to achieve this wing profile.
The CDC wing revolution came largely through Swiss fly tier Marc Petitjean in the 1980s and 1990s, who popularized the use of feathers from the oil gland of the duck to create floating wing materials with astonishing buoyancy. CDC feathers trap microscopic air bubbles and resist water absorption naturally, creating wings that float without any applied floatant. Tiers like John Juracek and Craig Mathews of Blue Ribbon Flies in West Yellowstone further evolved CDC dry fly patterns for the demanding spring creeks and tailwaters of the American West, where PMD hatches are legendary.
For decades, CDC was considered the gold standard for upright wing dry flies — delicate, buoyant, and highly realistic. The one drawback? CDC is a natural material with real limitations: it can become waterlogged after multiple fish, it must be dried and treated carefully, and quality varies between batches. Enter Moonlit's game-changing solution.
Moonlit Halo Hair: Reinventing the Upright Wing
Moonlit Halo Hair is a premium synthetic wing material made from polypropylene fibers — and it's one of the most significant advances in dry fly wing materials in years. Designed by Moonlit specifically as a high-performance substitute for CDC, Halo Hair solves virtually every limitation of the natural feather while amplifying its best qualities.
What makes Halo Hair different?
Polypropylene is one of the few materials in fly tying with a specific gravity lower than water — meaning it is inherently buoyant. The individual fibers of Halo Hair are engineered with just the right stiffness: firm enough to support the fly's weight and maintain the upright wing posture through multiple fish and casts, yet fine and translucent enough to create the delicate, semi-transparent wing appearance of a natural PMD dun. This engineered stiffness is critical — a wing that collapses under its own weight or folds onto the body is a wing that stops fishing.
Where CDC relies on oils and trapped air to float, Halo Hair floats because the polypropylene fibers themselves are hydrophobic. Water doesn't cling to or absorb into the material — it beads off and the fly rights itself. This means the Halo Upright Wing PMD bounces back from multiple catches, splashy takes, and rough water without becoming waterlogged. A single fly can fish far longer before needing a change.
The surface contact properties of Halo Hair are equally impressive. The material fans out naturally when tied in, creating maximum surface area contact with the water film — the same mechanism that gives CDC its legendary floatation. This wide footprint translates to better fly attitude and presentation, especially in slower, more technical spring creek water where fish have time to inspect every detail of your offering.
In the Smoke Dun colorway used in the Halo Upright Wing PMD, the material perfectly imitates the pale grayish-blue wing tones of the natural PMD dun — subtle, translucent, and incredibly lifelike.
Why the Halo Upright Wing PMD is a Must-Have Pattern
The Halo Upright Wing PMD checks every box for a great dry fly pattern:
- Quick and easy to tie — Minimal material count means you can bang out a dozen in an evening
- High-floating — The combination of Halo Hair wings and Semperfli Microfibbet tails keeps this fly riding proud on the surface
- Realistic silhouette — The upright wing profile triggers instinctive rises from PMD-selective trout
- Durable — Synthetic Halo Hair outlasts natural CDC by a wide margin
- Versatile — The basic recipe translates across multiple mayfly species and sizes
This is a pattern that belongs in every dry fly box — not just a few, but in a range of sizes to match PMDs across their entire hatch window and regional variations.
Best Sizes for PMDs: What to Stock and Why
PMDs (Ephemerella infrequens and Ephemerella inermis) are small-to-medium mayflies, and size selection is one of the most critical decisions you'll make during a PMD hatch. Fortunately, unlike color — which varies considerably from body of water to body of water — PMD sizing follows fairly predictable patterns.
| Size | When to Use | Notes |
|---|---|---|
|
#14
|
Early season / larger rivers / fast water
|
Largest PMDs; useful on bigger Western rivers like the Snake, Madison early in the season
|
|
#16
|
Prime season / most conditions
|
The most versatile and productive size; covers the majority of PMD hatches across North America
|
|
#18
|
Technical water / late season / spring creeks
|
Essential for picky fish on flat spring creeks and tailwaters; late-season PMDs trend smaller
|
|
#20
|
Ultra-technical situations
|
Heavily fished tailwaters and spring creeks; fish get extremely selective late season
|
For the Halo Upright Wing PMD, the Moonlit ML102 TOGATTA hook is available in sizes 14–18, covering the full productive range of this pattern. We recommend stocking at least six flies per size, with the heaviest emphasis on size 16 and 18. If you're heading to a technical spring creek or a heavily pressured tailwater, load up on 18s.
A word on body color: PMDs are famously variable in their body coloration — ranging from bright yellow-olive early in the season to a paler, more cream-yellow as summer progresses. The Semperfli Classic Waxed 12/0 in Primrose used in this pattern hits the sweet spot, delivering a soft, warm pale yellow that imitates the natural dun accurately across most conditions. When in doubt, fish the primrose body — it covers the widest range of scenarios.
Why You Must Have PMDs in Your Box: The Case for Being Ready
Ask any guide on a Western spring creek what single hatch you absolutely cannot afford to miss, and most will say the same thing without hesitation: the PMD hatch. Here's why:
1. PMDs are everywhere. Unlike many specialized hatches tied to specific river systems or geography, Pale Morning Duns inhabit virtually every freestone stream, spring creek, and tailwater across the American West, Pacific Northwest, much of Canada, and analogous pale mayfly hatches occur across Europe. If you're a traveling angler — or even if you fish the same home water year after year — PMDs will meet you there.
2. PMDs hatch reliably, often daily. During hatch season, PMDs don't tease you with a single event. They emerge in predictable daily windows, often for weeks at a stretch, giving you multiple shots at matching them correctly. A well-stocked PMD selection means you're prepared the moment those trout start rising.
3. PMD hatches bring big fish to the surface. Large, experienced trout that have learned to be cautious will often abandon their cover during a heavy PMD hatch. The sheer volume of insects on the water — combined with the extended drift time of the naturals — makes even the most selective fish commit to surface feeding. If you don't have PMDs in your box when that happens, you'll watch some of the best dry fly fishing of your life from the sidelines.
4. PMDs are the gateway hatch for technical dry fly fishing. Mastering PMD presentations — drag-free drifts on fine tippets, reading complex current seams, recognizing subtle sipping rises — makes you a better angler on every hatch. The PMD is where the dry fly education gets serious.
Bottom line: You should never, ever arrive at a piece of trout water from June through September without at least a dozen PMD patterns in multiple sizes. The Halo Upright Wing PMD gives you the edge when it matters most.
Regional PMD Hatch Charts: US, Canada & Europe
PMD timing is driven by three factors: water temperature (ideal emergence between 52–68°F), air temperature, and weather conditions. Overcast, mild days with stable barometric pressure consistently produce the best hatches. Bright, hot days often push hatches to shorter, more erratic windows or suppress them entirely. Expect the most reliable hatches in the 55–65°F water temperature range.
🇺🇸 United States — Regional PMD Hatch Chart
| Region | Peak Hatch Season | Daily Hatch Window | Ideal Conditions | Key Rivers/Waters |
|---|---|---|---|---|
|
Rocky Mountain West (ID, MT, WY, CO)
|
Late May – late August; peak June–July
|
10:00 AM – 2:00 PM
|
Overcast, mild 55–75°F air; water 54–66°F
|
Henry's Fork, Snake River, Madison, Gallatin, Firehole, Yellowstone, South Fork Snake, Beaverhead
|
|
Pacific Northwest (OR, WA)
|
Mid-May – early September; peak May–July
|
9:30 AM – 1:30 PM
|
Cool overcast mornings; water 52–62°F; minimal wind
|
Deschutes, Crooked River, Metolius, Yakima, North Umpqua
|
|
Great Basin / Southwest (UT, NV, NM, AZ)
|
April – October (elevation dependent); peak May–July
|
10:00 AM – 1:00 PM
|
High-elevation tailwaters; cooler temps suppress summer heat
|
Green River (UT), San Juan River (NM), Provo River (UT)
|
|
California
|
March – September (varies by elevation); peak April–June
|
10:00 AM – 2:00 PM
|
Coastal and Sierra streams; overcast marine-influence days
|
Fall River, Hat Creek, McCloud River, Upper Sacramento
|
|
Midwest (MN, WI, MI)
|
May – July; peak late May–June
|
10:00 AM – 1:00 PM
|
Cool spring mornings; water 50–60°F
|
Brule River (WI), Au Sable (MI), Spring Creek streams of MN
|
|
Northeast / Mid-Atlantic (PA, NY, VT)
|
May – July; peak May–June (Sulphur-dominant, PMD limited)
|
10:00 AM – 2:00 PM; evening Sulphur spinners
|
Overcast, cool; water 52–62°F
|
Delaware River (PA/NY), Brodhead Creek, Beaverkill (NY)
|
Note: PMDs (E. infrequens / E. inermis) are primarily a Western and Midwestern species. In the Northeast, the similar Sulphur (Ephemerella dorothea) fills the same ecological niche — the Halo Upright Wing PMD in size 16–18 with a warm yellow body is equally effective during Sulphur hatches.
🇨🇦 Canada — Regional PMD Hatch Chart
| Region | Peak Hatch Season | Daily Hatch Window | Ideal Conditions | Key Rivers/Waters |
|---|---|---|---|---|
|
British Columbia
|
Mid-June – early September; peak July–August
|
10:00 AM – 2:00 PM
|
Overcast, stable weather; water 52–64°F
|
Elk River, St. Mary River, Crowsnest River, Thompson River tributaries, Similkameen
|
|
Alberta
|
Mid-June – August; peak July
|
10:00 AM – 1:30 PM
|
Cool mornings; overcast preferred; water 50–62°F
|
Bow River, Oldman River, Crowsnest River, Livingstone River
|
|
Saskatchewan / Manitoba
|
Late May – July; peak June
|
10:00 AM – 1:00 PM
|
Early summer cool; spring systems
|
Qu'Appelle River system, prairie spring creeks
|
|
Ontario / Quebec (Eastern Canada)
|
May – July; Sulphur/PMD analogs more prominent
|
10:00 AM – 2:00 PM
|
Cool overcast spring days; water 50–62°F
|
Credit River, Ganaraska, Saugeen (ON); Matapédia (QC)
|
🇪🇺 Europe — Pale Mayfly Hatch Chart (PMD Analogs)
A note for European anglers: True North American PMDs (Ephemerella infrequens/inermis) are not present in European river systems. However, several closely related pale mayfly species occupy the same ecological niche and produce equally dramatic hatches that the Halo Upright Wing PMD imitates superbly. The most important are Ephemerella ignita (Blue-Winged Olive), Serratella ignita, Pale Watery (Baetis fuscatus, Centroptilum luteolum), and the Small Spurwing — all of which produce pale-winged, upright-wing duns that trout key on with the same selectivity as PMDs in North America.
| Country / Region | Species & Common Name | Peak Season | Daily Hatch Window | Ideal Conditions |
|---|---|---|---|---|
|
United Kingdom & Ireland
|
Blue-Winged Olive (E. ignita)
|
June – September; peak July–August
|
Evening: 6:00 PM – 9:00 PM
|
Warm evenings; water 55–65°F; stable pressure
|
|
United Kingdom & Ireland
|
Pale Watery (Baetis fuscatus)
|
April – October; peak May–June & September
|
Midday: 11:00 AM – 2:00 PM
|
Cool overcast; light upstream wind; water 50–62°F
|
|
United Kingdom & Ireland
|
Small Spurwing (Centroptilum luteolum)
|
May – October
|
Late morning – early afternoon
|
Similar to Pale Watery; overcast preferred
|
|
France / Spain / Central Europe
|
Blue-Winged Olive (E. ignita)
|
June – September; peak July
|
Evening: 6:00 PM – 9:00 PM
|
Warm stable evenings; chalk streams and freestone
|
|
France (Normandy chalk streams)
|
Pale Watery analogs
|
April – October
|
Late morning
|
Overcast; chalk stream spring creeks; water 52–62°F
|
|
Scandinavia (Norway, Sweden)
|
Ephemerella species analogs
|
Late June – August
|
Late morning – early afternoon
|
Cool northern summers; water 48–60°F
|
|
New Zealand (bonus)
|
Deleatidium species (Upright Wing Duns)
|
October – April (Southern Hemisphere summer)
|
10:00 AM – 2:00 PM
|
South Island rivers; overcast ideal; water 52–64°F
|
Tying the Halo Upright Wing PMD: Quick, Simple, and Deadly
One of the most appealing things about this pattern is its straightforward construction. There's no elaborate technique, no fussy material manipulation — just clean, efficient steps that produce a highly effective fly.
Materials at a Glance:
- Hook: Moonlit Premium TOGATTA ML102, Size 14–20
- Thread/Body: Semperfli Classic Waxed 12/0 Primrose
- Tail: Semperfli Microfibbets Iron Blue Dun
- Wing: Moonlit Halo Hair Smoke Dun
- Thorax: Moonlit Beaver Dubbing Golden Olive
The Semperfli 12/0 Classic Waxed thread does double duty here — it's fine enough to build a clean, slim body that mimics the slender abdomen of the natural PMD, while the primrose color delivers that warm pale yellow body tone without any additional material needed. Fewer materials, faster tie, better fly.
The Semperfli Microfibbets in Iron Blue Dun give this fly a crisp, realistic tail — splayed slightly to help keep the hook bend riding just above the surface film and providing additional stability for the fly's attitude on the water.
The Moonlit Beaver Dubbing in Golden Olive builds the thorax with a slightly warmer, deeper hue than the body, mimicking the slightly darker thorax coloration of the natural. Beaver dubbing packs and shapes beautifully, and the subtle sheen of the natural fur fibers adds a touch of life to the fly under the surface's light.
Everything comes together to create a fly that looks right, fishes right, and keeps working long after lesser patterns have given up.
Final Thoughts: Stock Up, Match the Hatch, and Get After It
The PMD hatch is one of the finest events in trout fishing — a reliable, widespread, season-spanning hatch that brings sophisticated fish to the surface and rewards the angler who shows up prepared. The Moonlit Halo Upright Wing PMD gives you that preparation in the most efficient package possible: a quick-tie, durable, high-floating pattern built around premium materials that consistently outperform the traditional alternatives.
Tie a supply in sizes 14, 16, and 18 before your next outing. Know your regional hatch timing. And when the PMDs start drifting and the trout start rising, you'll be ready.
Tight lines — Moonlit Fly Fishing
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