CannaGLAP
Grow cannabis in Davis, CA
Growing cannabis in Davis: one grow room, a hot July and a freezing December
Davis puts a home grow through two hard seasons, not one. July afternoons average 93°F, with about 23 days at 90°F or hotter. December nights average 38°F, and about 8 of them freeze.
A setup built for summer heat meets a cold garage floor in winter, and one built for winter cooks in July. Which half of the year was yours built for?
Adults 21 and over: yes. Plant limit: 6 living plants per private residence, however many adults live there.
Locked space, not visible from a public place; cities and counties can set reasonable rules for indoor grows (but cannot ban them) and may ban outdoor grows; a landlord may prohibit growing on a rental. Source: Department of Cannabis Control; conditions: Prop 64 text as passed in 2016 (H&S Code 11362.2 and 11362.45). Local rules (landlords, HOAs, city codes) can add more; this is a summary, not legal advice.
A Davis grow room, summer and winter
The numbers come from the Davis experimental farm station, 2 miles away and 60 feet up. Heat there runs from May into October: about 7 days at 90°F or hotter in May, 14 in June, 23 in July, 22 in August, 17 in September and 4 in October, close to 88 a year. A tent adds its own warmth to a hot garage, so run the lamp overnight from June through September. July and August nights average 56 to 57°F, the cheapest cooling you have.
Winter asks for the same schedule for the opposite reason. December and January lows average 38°F, and the farm station logs about 18 freezing nights a year, most of them in those two months. A garage tent with the lamp off overnight can leave roots cold until morning. Run the light through the coldest hours, set seedlings on a heat mat, and put a foam pad between pots and the concrete.
The air is dry when it is hot. Humidity averaged 41 percent in June and 40 in July of 2024, and cuttings with no roots yet lose water faster than they take it up, so keep them under a clear humidity cover for two weeks. The same dry air helps in flower: September and October averaged 46 percent together, light mold pressure for a garage or a room with the windows open.
January reads 85 percent outdoors, but cold air carries little water, and a heated house dries it further. An unheated, damp garage or shed is the one winter space where a dehumidifier earns its keep.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 56 | 61 | 66 | 73 | 81 | 89 | 93 | 93 | 90 | 80 | 65 | 56 |
| Avg low °F | 38 | 41 | 44 | 47 | 52 | 56 | 57 | 56 | 55 | 50 | 43 | 38 |
| Humidity % | 85 | 41 | 40 | 47 | 48 | 43 |
Highs and lows: NOAA 1991 to 2020 normals, Davis 2 Wsw Exp Farm station (2 miles away). Humidity: Open-Meteo historical model data, average daily humidity in 2024, for the months shown. Planning averages, not a forecast.
Outdoors in Yolo County
Under California law, a private residence may keep 6 living plants, no matter how many adults it houses, locked up and out of sight from any public place. Local governments can set reasonable rules for indoor grows (they cannot ban them) and may ban outdoor ones, so the City of Davis rules get a look before planting.
Where outdoor plants are allowed, sow indoors from March 4 through March 18 and move plants out on April 15 or later, about two and a half weeks after nights begin averaging 45°F (March 28). In an early year, the first frost can arrive by November 13, about 212 days on, still room for long-flowering plants. The finish is the tradeoff: a plant ripening in September sits through about 17 days of 90°F heat, while an October finish meets about 4 hot days and 43 percent air. Shade pots on July and August afternoons and water early.
| Last spring frost | Feb 10 in a typical year, Mar 11 to be safe (later only 1 year in 10) |
|---|---|
| First fall frost | Dec 1 typical, as early as Nov 13 (1 year in 10) |
| Frost-free season | about 295 days |
| Nights stay 50°F or warmer | May 6 to Oct 13 |
| Start seeds or clones indoors | Mar 4 to Mar 18 |
| Move plants outdoors | Apr 15 or later |
Your Davis grow, kept to yourself
Davis is a college town. Rentals near the UC Davis campus turn over with the school year, and roommates, landlords and new neighbors come with them. Then there is the Davis Farmers Market in Central Park, and the crowds of UC Davis Picnic Day, where gardeners trade tips without being asked.
Your Canna GLAP journal is encrypted on the phone itself, before upload. Anyone who cracked our servers would turn up grow records in code, with nothing to unlock them. That guards what you write, not what a roommate smells in the hallway, so a carbon filter still earns its place.
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 Davis ask
Does it freeze in Davis?
Yes. The Davis station averages about 18 freezing nights a year, mostly in December and January. Frost typically ends by February 10 and runs later than March 11 only about 1 year in 10.
How do I keep a grow tent cool in a Davis summer?
Run the lamp overnight from June through September, when afternoons hit 90°F on about 14 to 23 days a month, and pull in the 56 to 57°F night air of July and August. A cooled bedroom usually beats a garage in July.
When can I plant cannabis outside in Davis?
On April 15 or later, with seeds sown indoors March 4 to 18, if your local rules allow outdoor plants. That leaves about 212 days before frost can arrive in an early year, around November 13.
Growing near Davis
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