CannaGLAP
Grow cannabis in Tigard, OR
Growing cannabis in Tigard: the air gains 26 points of humidity between July and October
Tigard's summer is dry enough to fool you. At the Beaverton 2 SSW station, 2.9 miles from town, July averages about 53 percent humidity with highs near 82°F. Plants in veg love it. Then the numbers turn: about 62 percent in August, 69 in September and 79 in October.
Those are the weeks a flowering plant packs on its densest buds. So which month is your setup really built for: the easy one, or the one that decides the harvest?
Adults 21 and over: yes. Plant limit: 4 per household, however many adults live there.
Four adults in one home still means 4 plants in total. Source: OLCC FAQ. Local rules (landlords, HOAs, city codes) can add more; this is a summary, not legal advice.
A Tigard grow room, planned backward from October
Work from the finish. A photoperiod plant flipped to flower in early August reaches its last, heaviest weeks just as outside air climbs from 69 to 79 percent, and every intake fan in a spare room off SW Main Street or an apartment near Bridgeport Village pulls that air into the canopy. A dehumidifier sized to the room, running from September on, does more for this harvest than another light would.
Keep the lamp-off temperature close to the lamp-on one through late flower. October nights outside average about 43°F, and a room that cools sharply in the dark lets moisture settle on the buds. A thermostat-controlled heater, set to run only through the dark period, closes that gap.
Winter is quiet rather than easy. December and January lows sit near 34°F, and the two months bring about 20 freezing nights between them. January's 86 percent outdoor humidity hardly touches a tent in the heated house, since warming cold air dries it. A detached garage or unheated shed is different: chilly, damp air there beads on the tent walls, so a heater and a dehumidifier go in together.
Summer asks the least. July and August each see 90°F on roughly 5 days, and moving the light period to the night covers them. The dry spell is the one time to add moisture: clones rooting in 53 percent air want a humidity dome or a little humidifier nearby.
Heater safety: use one with tip-over and overheat shutoff, plug it straight into a wall outlet (not an extension cord or power strip), and keep it a few feet from tent fabric and plants.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 49 | 53 | 58 | 64 | 70 | 75 | 82 | 82 | 77 | 65 | 54 | 48 |
| Avg low °F | 34 | 35 | 37 | 40 | 46 | 50 | 54 | 54 | 50 | 43 | 38 | 34 |
| Humidity % | 86 | 64 | 53 | 62 | 69 | 79 |
Highs and lows: NOAA 1991 to 2020 normals, Beaverton 2 Ssw station (2.9 miles away). Humidity: Open-Meteo historical model data, average daily humidity in 2024, for the months shown. Planning averages, not a forecast.
Tigard outdoors: four plants and a mid-October deadline
Oregon allows 4 plants per household, however many adults live there, so a home with four adults still shares 4. Start seeds indoors from March 31 to April 14 and plant out on May 12, when nights first average 45°F. Frost usually ends around April 1 and seldom returns after April 26, so it is the cold nights, not frost, that set the date.
From May 12 to an early first frost on October 19 is about 160 days. The typical frost holds off until about November 6, but by then a plant has spent weeks in 79 percent air, and nights stop averaging 45°F after October 6. Choose strains known to resist mold that finish in late September, open up each plant's interior in August, and keep a rain cover handy.
| Last spring frost | Apr 1 in a typical year, Apr 26 to be safe (later only 1 year in 10) |
|---|---|
| First fall frost | Nov 6 typical, as early as Oct 19 (1 year in 10) |
| Frost-free season | about 222 days |
| Nights stay 50°F or warmer | Jun 15 to Sep 13 |
| Start seeds or clones indoors | Mar 31 to Apr 14 |
| Move plants outdoors | May 12 or later |
Four plants, and the notes that go with them
Tigard is a town where you keep running into people: at the Sunday farmers market on Universal Plaza, at the Downtown Tigard Street Fair, at the Festival of Balloons. Someone who knows you grow may ask which of your four made it through a damp October. How much you say is your call, and your log should not make that call for you.
Before upload, Canna GLAP locks the grow with encryption on your phone. Anyone breaking into our servers would walk away with a Washington County grow journal in scrambled form, and no key to open it.
What is encrypted: your plants, notes, photos, feed logs and harvests. What is not: account details (such as your email, name and plan), a grow name or town if you type one, your team, and your sensors' names. The full list: what a hacker would get.
Questions growers in Tigard ask
When should I plant cannabis outside in Tigard?
May 12. Sow seeds indoors from March 31 to April 14 first. Frost has usually passed weeks before, but average nights stay below 45°F until May 12.
Is bud rot a problem in Tigard?
It is the main late-season risk. Humidity averages about 69 percent in September and 79 in October, so outdoor plants should finish by late September and an indoor flower room needs a dehumidifier from September on.
Can four adults in one Tigard home each grow four plants?
No. Oregon's limit is 4 plants per household, however many adults live there, so four adults in one home still have 4 plants in total.
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