When to plant zucchini in Fort Collins: 7 June – 4 August

In Fort Collins, zucchini: sow for seedlings from 26 April to 14 July; plant into a greenhouse from 17 May to 4 August; plant out into open ground from 7 June to 4 August. For plants and seeds, the places nearby include Green Dog Farms (farm shop, 6 km) and Garden Sweet Farm Stand (farm shop, 7 km); addresses and opening hours are below.

Zucchini in Fort Collins: soil, season and weather

In Fort Collins the soil, not frost, sets the date: the last frost is over around 25 April, but the top 7 cm of soil reaches 18 °C — the minimum on the zucchini card — only around 7 June, 43 days later.

Last spring frost	25 April
Top 7 cm of soil at 18 °C	7 June, 43 days after the last frost
First autumn frost	21 October, 136 days after the start
Days in the bed to the first harvest (card)	36
First harvest, if planted in this window	13 July – 9 September
Days left for picking	100
Daylight	14:29 on 17 May, 14:58 on 7 June
Watering outdoors when fruiting (card)	every 3 days; the driest month, October, has 4 rainy days

The same dates in Fort Collins hold for Cucumber, Bell Pepper, Eggplant, Pumpkin and Watermelon.

Zucchini in Fort Collins: care after planting

Planted on 7 June: in the first weeks water every 4 days.

Pests and diseases of zucchini to watch for:

Weather in Fort Collins during the zucchini season

About 153 mm of rain falls in the season; October is the driest month (20 mm) and June the wettest (40 mm).

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	28.4	12.7	40	8	15:03
July	31.6	16.2	37	7	14:48
August	30.5	15.2	34	7	13:49
September	27.7	11.2	22	4	12:30
October	18.8	3.8	20	4	11:11

ERA5 2016–2025, Open-Meteo

Zucchini in nearby cities

Around Fort Collins, Pueblo is 35 days earlier and Cheyenne 1 day later.

City	Distance	Date	Difference
Cheyenne	69 km	8 June – 27 July	1 day later
Denver	90 km	28 May – 29 July	10 days earlier
Colorado Springs	192 km	6 June – 29 July	1 day earlier
Pueblo	258 km	3 May – 11 August	35 days earlier
Grand Junction	340 km	6 May – 10 August	32 days earlier
Rapid City	420 km	6 June – 26 July	1 day earlier

Where to buy zucchini plants and seeds near Fort Collins

Buy plants ready to set out from 7 June to 4 August (from 17 May to 4 August for an unheated greenhouse); seed for raising your own is sown from 26 April to 14 July. Within 15 km of Fort Collins OpenStreetMap lists 10 garden centres, 4 farm-supply shops, 2 plant nurseries, 3 markets and 6 farm shops (collected 28 October 2026).

Green Dog Farms — farm shop
West Vine Drive 1807, Fort Collins · 6 km
Garden Sweet Farm Stand — farm shop
West Willox Lane 719, Fort Collins · 7 km
Cresset Farms — farm shop
East County Road 52 5609, 80524 Fort Collins · 12 km
Blue Bench Farms — farm shop
Highway 257 33772, 80550 Windsor · 15 km

Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

Questions