Nimblewill being a warm season grass has a competitive advantage over the
cool season grasses i.e. bluegrass, fescues, and rye grasses and so from the
fall to mid spring lawns have big patches of "dead looking turf" that does not
green up until late April. That crap can take over an entire lawn in a few
seasons and the only way to really control it is to mark it then kill it after it
starts growing and then reseed the areas.

Since I’ve just put on my shirt to go out and weed the tomatoes, I’ll only mention the single biggest change: the nature of the soil. In the past 15 or 20 years the earthworms have proliferated so greatly that the structure of the soil has changed.

I’m not just talking about the places where we’ve added compost yearly, I’m talking about nearly every area of the whole 30 acres. The soil is still very fertile and things grow well, but it’s not exactly friable. It’s more what I would call granulated. It’s unsettling.

I’ll be very interested to hear other gardeners’ observations. This is a great question NRaleighLiberal, thanks.

that changes and harms the soil quality. http://ulster.cce.cornell.edu/gardening/invasive-nuisance-species/jumping-worms-invasive-species

i started this little farm 7 years ago. the first year, spring arrived a full year early. i sync up the season and the calendar by when my tulips bloom. they used to always bloom right around mother's day. within a week either way. i always noted this, because they dont do that well in my garden, so i cherish them. but they are too attractive a target for well meaning kids when they are in full bloom on mother's day. some years i spent the day on the front porch just to keep an eye on them.

since that first year, tho, spring has been later and colder and wetter every.damn.year.
i had not been worrying thaaaaat much about climate change as it related to me, as we are not really going to bear the brunt of most of it. rainfall is not that big a worry as i have unmetered city water. and if i use too much, it travels through the sandy soil the back into the lake from whence it came.
high temps are thought to be the worst threat, and that is one reason i love the heirlooms that you started me out w, my friend. i figure i will have land races going of my favorite crops.
plus i am in the bowl of lake michigan, in a micro climate that is well buffered.

but these springs. oh.my.god.
after that first year, it has been worse each year. it has taken such a toll on my seedlings, despite ramping up my weather weather mitigation every year.
not just the cold, but the clouds. all day, day after day.
things are fine under the light, i move them out to a hoop house or my new, little lean to greenhouse, and BAMMMMM!

i had such a great spring, then i lost almost half of what i moved out into the weather.

i have a cardboard model of my dream farm building.
a mini barn.
it aint gonna happen now, methinks, tho there might be a hail mary out there.

but i have to have something, and soon.
i at least need to invest $2-30k in a good year round prefab.
another $5k for renewables to run it.
if i dont do it, this is never anything more than an expensive hobby.

This past winter was a for-real Zone 4 winter but those are becoming more and more infrequent. I still won't plant Zone 5 plants in my garden but some people are having success with them in protected areas. This spring was unusually cool and wet, unlike some recent springs which came early, followed by a hard frost, which devasted the apple orchards. One problem seems to be that the weather has become unpredictable year-to-year. Maybe it will be very hot again this summer, like last summer, or maybe it will rain all the time, which is what's happening so far. I have a lot of native plants, which seem able to withstand more extreme conditions, so I'll be watching those to see how well they cope.

Zone 6 more or less. I grew up in this area and my father was an avid gardener. He always said that the first week in the spring you could count on being frost free was the last week in May. This year our last frost was in early April.