When to plant Winter squash in Colorado, United States

Winter squash can be planted after June 26, when air temperature is consistently in a range between 50°F and 95°F and soil temperature is above 45°F.

Winter squash details page

Growing Winter squash in Colorado

Days suitable for growing Winter squash in Colorado

On average Winter squash needs from 80 to 110 days to mature and produce harvest.

It could prove difficult to start growing Winter squash in Colorado, when planting directly into soil, due to short growing period suitable for growing Winter squash.

In order to have a chance of getting any harvest, all available season extention methods should be utilised.

Start seeds indoors

June 26 is on average first day in Colorado that has required temperatures for young Winter squash seedlings to grow, without worrying about cold damage.

Seeds can be started indoors beween May 29 and June 20, this way they will be ready just in time for transplanting on June 26.

Seedlings started after June 20 might not have enough time to mature and produce harvest.

Use a cold frame

When using a cold frame in a beggining of growing season You can protect young plants from possible temperature drops, this way growing season can start up to 2 weeks earlier.

Use an additional shading

On days, when air temperatures are expected to raise above 95°F, which is in top of tolerable range for Winter squash, consider using additional shading to prevent heat shock.

Total frost free days	108
Last frost expected date	May 25
First frost expected date	September 10
Dates with ideal conditions
Dates with suitable conditions	June 07 June 14 to June 20 (7 days) June 22 to June 24 (3 days) June 26 to September 08 (75 days)
Total days ideal for growing Winter squash in Colorado	0
Total days suitable for growing Winter squash in Colorado	86
Days needed for Winter squash to mature and produce harvest	80 - 110
Seed can be planted directly into soil	no
Seed has to be started indoors	yes

Notable temperature facts for growing Winter squash in Colorado

Table with days suitable to grow vegetables in Colorado

Tolerable temperature range for Winter squash: 50°F to 95°F

	Week	Average temperature	Possible min and max temperature	Suitable for Winter squash
1	January 01 - January 03	9°F to 33°F	-7°F to 42°F
2	January 04 - January 10	15°F to 38°F	1°F to 49°F
3	January 11 - January 17	16°F to 40°F	2°F to 51°F
4	January 18 - January 24	15°F to 36°F	1°F to 46°F
5	January 25 - January 31	11°F to 35°F	-7°F to 48°F
6	February 01 - February 07	13°F to 38°F	-10°F to 57°F
7	February 08 - February 14	13°F to 37°F	-5°F to 49°F
8	February 15 - February 21	11°F to 36°F	-12°F to 50°F
9	February 22 - February 28	12°F to 38°F	-2°F to 50°F
10	March 01 - March 07	18°F to 45°F	0°F to 60°F
11	March 08 - March 14	22°F to 45°F	-3°F to 58°F
12	March 15 - March 21	20°F to 46°F	7°F to 57°F
13	March 22 - March 28	23°F to 48°F	7°F to 65°F
14	March 29 - April 04	25°F to 53°F	13°F to 68°F
15	April 05 - April 11	29°F to 58°F	14°F to 71°F
16	April 12 - April 18	26°F to 52°F	11°F to 71°F
17	April 19 - April 25	31°F to 57°F	14°F to 73°F
18	April 26 - May 02	35°F to 63°F	27°F to 75°F
19	May 03 - May 09	37°F to 64°F	27°F to 77°F
20	May 10 - May 16	38°F to 64°F	27°F to 78°F
21	May 17 - May 23	40°F to 65°F	25°F to 81°F
22	May 24 - May 30	41°F to 68°F	29°F to 80°F
23	May 31 - June 06	46°F to 72°F	36°F to 87°F
24	June 07 - June 13	48°F to 77°F	38°F to 90°F
25	June 14 - June 20	52°F to 80°F	42°F to 92°F	TRUE
26	June 21 - June 27	51°F to 78°F	40°F to 88°F	TRUE
27	June 28 - July 04	53°F to 81°F	46°F to 87°F	TRUE
28	July 05 - July 11	55°F to 83°F	49°F to 92°F	TRUE
29	July 12 - July 18	58°F to 86°F	52°F to 92°F	TRUE
30	July 19 - July 25	58°F to 85°F	53°F to 92°F	TRUE
31	July 26 - August 01	58°F to 82°F	52°F to 89°F	TRUE
32	August 02 - August 08	56°F to 82°F	51°F to 89°F	TRUE
33	August 09 - August 15	56°F to 83°F	51°F to 88°F	TRUE
34	August 16 - August 22	56°F to 83°F	50°F to 90°F	TRUE
35	August 23 - August 29	55°F to 83°F	50°F to 90°F	TRUE
36	August 30 - September 05	54°F to 82°F	48°F to 89°F	TRUE
37	September 06 - September 12	50°F to 78°F	28°F to 90°F
38	September 13 - September 19	48°F to 76°F	38°F to 83°F
39	September 20 - September 26	46°F to 75°F	40°F to 82°F
40	September 27 - October 03	46°F to 71°F	36°F to 82°F
41	October 04 - October 10	41°F to 68°F	25°F to 78°F
42	October 11 - October 17	35°F to 63°F	18°F to 76°F
43	October 18 - October 24	36°F to 62°F	20°F to 75°F
44	October 25 - October 31	23°F to 49°F	-5°F to 69°F
45	November 01 - November 07	28°F to 55°F	7°F to 68°F
46	November 08 - November 14	25°F to 51°F	9°F to 65°F
47	November 15 - November 21	25°F to 49°F	4°F to 64°F
48	November 22 - November 28	20°F to 44°F	-2°F to 58°F
49	November 29 - December 05	20°F to 44°F	4°F to 63°F
50	December 06 - December 12	19°F to 43°F	6°F to 54°F
51	December 13 - December 19	13°F to 35°F	-4°F to 51°F
52	December 20 - December 26	16°F to 41°F	-9°F to 52°F
53	December 27 - December 31	15°F to 36°F	-2°F to 50°F

Days with suitable temperature for growing Winter squash in Colorado

Winter squash details page

For more precise weather statisctics and planting information, please select a County in Colorado.

All data is provided “as is” without warranty or any representation of accuracy, timeliness or completeness.

Average daily temperatures were calculated using

Weather data provided by OpenWeather