Allergy Season on the Road: Managing Seasonal Allergies While RVing

Spent 40 years as a diesel mechanic. Spent those 40 years breathing in fumes, dust, brake cleaner, and whatever else was floating around the shop. Never had allergies. Not once. Then I retired, bought a 2019 Keystone Montana, and drove to the Texas Hill Country in December.

Mountain cedar. Juniperus ashei. They call it "cedar fever" down there and let me tell you, they ain't exaggerating. Within 48 hours my eyes were swollen shut, my nose was running like a faucet, and I was sneezing so hard I pulled a muscle in my back. I'm not making that up. I actually pulled an intercostal muscle from sneezing. Sixty-three years old and I got taken out by a tree.

That was three years ago. Since then I've developed a systematic approach to managing seasonal allergies while traveling, because when you're an RVer, you're driving through different pollen zones constantly. What doesn't bother you in Colorado might wreck you in Georgia. Here's my system.

Step 1: Know What You're Allergic To

Get tested. I went to an allergist in San Antonio (Dr. Khoury at Alamo Allergy, good guy) and did a full skin prick test. Turns out I'm allergic to mountain cedar (obviously), ragweed, Bermuda grass, dust mites, and mold. Knowing the specific triggers lets you plan your route around peak seasons, or at least know what you're walking into.

Cost me $350 out of pocket because I have a high-deductible Medicare supplement. Worth every penny for the information.

Step 2: Track Pollen Counts

I check pollen.com every morning like other people check the weather. Actually, I check it before the weather. The site gives you a 5-day allergy forecast by zip code, broken down by tree, grass, and weed pollen. I also use the Zyrtec AllergyCast app which overlays pollen data on a map — helps with route planning.

I keep a log in a composition notebook (old school, I know, but I can't lose it like a phone app). Date, location, pollen levels, symptoms rated 1-10, medications taken. After two years of data, I can predict pretty accurately where and when I'm going to have problems.

Step 3: RV Preparation

This is where the mechanic brain kicks in. Your RV's ventilation system is either your best friend or your worst enemy during allergy season. Here's what I've done to mine:

Replaced the standard return air filter on my rooftop AC with a Filtrete 1900 cut to size. The factory filter catches about as much pollen as a screen door catches rain. The Filtrete is rated for particles down to 0.3 microns. Pollen is typically 10-100 microns. The math works.

Sealed the gaps around my slide-outs with additional weatherstripping. Every RV has gaps around the slides where outside air (and pollen) infiltrates. I used 3M Marine Grade silicone sealant on the exterior seams and foam weatherstrip tape on the interior gaskets. Took about three hours and $40 in materials.

Added a Levoit Core 300 air purifier inside the RV. HEPA filter rated for 219 square feet, which covers my living area. I run it on medium 24/7 during high-pollen periods. Filter replacement is about $20 every six months. I can feel the difference within an hour of turning it on — the air just feels cleaner.

I keep windows and vents closed during peak pollen hours (5-10 AM typically). Use the AC for air circulation instead of opening windows even when the temperature is comfortable.

Step 4: Medication Protocol

I worked this out with Dr. Khoury and it's been reliable:

• Daily: Flonase nasal spray (two sprays each nostril, morning) — this is the baseline, non-negotiable
• Daily during allergy season: Zyrtec 10mg (cetirizine) — I take it at night because it makes me slightly drowsy
• As needed for breakthrough symptoms: Benadryl 25mg — but only at night because it knocks me flat
• Eye drops: Pataday (olopatadine) once daily when my eyes are acting up

I start the Flonase two weeks before entering a known problem area. Nasal steroids work best when they've had time to build up in your system. Starting them after you're already symptomatic is like closing the barn door after the horse is gone.

Step 5: Route Planning

I avoid the Texas Hill Country from December through February (mountain cedar). I avoid the Southeast from April through June (grass pollen peak). I avoid the Great Plains in August and September (ragweed). This isn't always possible, but when I have flexibility in my schedule, I plan around peak allergy seasons.

The best allergy months for me are October and November almost anywhere, and the desert Southwest is generally good year-round except during spring winds that kick up dust.

Step 6: Personal Hygiene

Shower before bed on high-pollen days — gets the pollen off your hair and skin so you're not breathing it all night. Change clothes when you come inside after extended outdoor time. Wash your bedding weekly in hot water. I also rinse my sinuses with a NeilMed sinus rinse, which sounds disgusting and kind of is, but it physically flushes out pollen and reduces symptoms noticeably.

It's not complicated. It's just methodical. Same way you'd approach a diagnostic on an engine — identify the problem, understand the system, apply the fix in the right order, monitor the results. Allergies are just another maintenance item. And like any maintenance, ignoring it only makes things worse.